No hint of that so far, however we haven't heard a word from the other branches of the White Court since "White Night," so it is possible that the Raith family will find itself on the outside looking in ...

That seems unlikely, to me.
Skavis & Malvora both got decapitated in the Raith Deeps -- not only the individuals who were their leaders, but the very-strongest of their Whamp's.  The Raith leadership (and strongest members) are intact.  I don't doubt that the Raiths took steps at  that point to "raid" the resources of their rivals, stripping them also of mundane resources/power.

This may be why Lara is making her power-play right now:  Thomas remarks (in Cold Days) that Lara is "getting scary" in how far she's extending control (where previously the Whamp's had limited themselves to the local Chicago scene, maybe some State elections, but now Lara's moving outside that scope (n.b. she had a USN Destroyer group in position in the Gulf, with military choppers standing by to violate Mexican airspace)).  But for the first time, the White Court resources are largely united, instead of the semi-détente as Skavis & Malvora maneuvered to take the White Throne; such that most of the effort of most of the Whamp's was focused internally).
 
But I'm sure Lara is too canny to just be ignoring Skavis & Malvora.  She knows the strongest of them will be emerging as new leadership, a new generation of challengers.  She knows that if she just ignores this, they will move against her... & she'd be ignorant of it.  So she'll be keeping more than a "weather eye open" to the internal politics, still.

... Dead, is D-E-A-D,  nothing remains of the host.

You are wrong:  language remains.  Rampires can speak normally, and don't need years to re-learn "from birth."  Also:  ghosts remain; and ghosts retain the memories that would be so critical for a Rampire to "fake it 'til they make it."

Or maybe part of the Ramp birth-process is to take a magical "brain-scan" of the dying host -- the human's life flashes before the rampire's eyes...

You are assuming that nothing around Harry changes, that all the people around him remain the same..  That's the mistake I think, because Harry's choice and his change in this other universe doesn't happen in a vacuum.

No, I agree:  things around Harry will begin changing, from the moment of "the Choice."  Harry changes, so what Harry does changes -- how he acts, how he reacts -- and everyone in  his orbit will in turn be changed.

But Michael's northstar isn't Harry; it never was.  He'll be among the less-changed (at least for the first few books); I don't expect any of Harry's changes will affect Michael's faith, or status as a Knight, or his Divine Guidance to help others in need.

And because there is a confluence in Chicago -- all of the same "dark powers" that Harry noted are still coming to bear, there -- I think Michael will more-often be Guided to Murphy's aid, than he originally was in the first few books.

...
I do, because it is an important point!  Also I think you are confusing White Court Vamps with Red Court Vamps, while both are vampires, they are nothing alike..  WCVs appear human and in most ways are very human, RCVs are not.. RCVs can put on a human mask, and act human, but there is nothing human about them as we saw when Harry pushed Bianca with his sunshine hanky.. 

I think the WC are human, yes; humans with a separate entity inside them, the "hunger demon."
Some Whampires are more in control, others less-so.  Mab says(implies?) that Thomas is human-enough to become a Knight, and Uriel seems to have a comparable level of interest in Whamps as he is in other Mortals.

RCV's are inhuman.  They're like insects that have a parasite eat its way out of them, killing them.  The half-turned Red is still human, but the full Rampire kills the host during birth.

None of which is to the point of the OP/topic:  how much of the mind (memories, predilections, etc) of the human host remain with the full Rampire?  Does the Ramp have the same "favorite color" as the human had?  Do they remember what that favorite color was?  Do they remember that "having a favorite color" is even a thing?

I will allege that some level of memory remains; while I think they're born ravenously-hungry, Rampires are too capable of "pretending" to be human, too quickly thereafter.  It appears VERY much that there must be some level of memory retained, or they wouldn't be able to "fake it" as well as they do.

Will she?  Or will she take the attitude that whatever it is, it is a law enforcement issue so some civilian carpenter can butt out?
 

Remember:  at the point of divergence, it's the exact same Murphy, with the exact same attitudes.  So yes, there may be some suspicion/distrust, just as she wasn't yet to the point of trusting Harry.  Also remember:  Murphy doesn't need to "call Michael for help" in order for Michael to show up via his own guidance.

But she'll be just as in-need of assistance from Michael as she was from Harry.  How many times will Michael need to selflessly risk himself to pull her (and other SI) out of danger, before she trusts him ... at least a little bit?

Michael's fundamental goodness is something that will speak to Murphy; and his free and ready faith (which Harry *never* displays) will do so too.

= = =

In the end, of course, it will depend 100% on how Jim writes it; the whole point may be moot; maybe one or both of them die in the stories between GP & MM...

Probably NSFW, in case you're at work; tho neither X- nor R-rated.
Music video, so not quiet, either.

https://www.youtube.com/watch?v=DsxzBCr2zNM
 

You are assuming they would still have contact with their friends and close family, there is no evidence of that...

I'm pretty sure the Rampires selectively turned individuals in critical positions, so they could have their people in those critical positions; so fooling colleagues seems to have been Rampire SOP.

At least some effort to keep friends & close family fooled seems obvious, even if it's just long enough to enact breakups/etc (or turn them, in turn (but that'd be an every-widening pool of complications)).

I don't think Jim has ever explained it in detail, but I presume he's considered his setting in  far more depth than he has put out in public.

...Even if they did,that doesn't biologically change what they have become, which is not human!

I'm not sure what about this point is so important to you.

It doesn't seem relevant to the OP's issue, and I haven't seen anyone disagreeing with you, but you keep returning to re-emphasize it.

But maybe enough that Murphy ends up dead earlier than in the canon timeline.  In canon, Murphy was better equipped to deal with the supernatural threats in Chicago because Harry brought her fully in, shared with her knowledge about the supernatural world and what was happening, protected her as best as he could and as she would allow, etc. while she did her job.  Without Harry's help or the same level of protection, is she able to do her job and stay alive as long as she did in canon?

I am relatively-confident Mirror!Murphy will be alive; simply because of the vast opportunities it gives Jim to further torture Harry.

Early-books Harry was still giving Murphy lots of stay-alive info (albeit limited/incomplete), and I expect that didn't stop completely when he made the Choice.  Remember that Murphy got so deeply into the supernatural because of Harry.  Without Harry there, opening the doors he opened, Murphy's likely to have had shallower, less-dangerous encounters. 

Alternatively, maybe Mirror!Murphy teamed up with Michael, who -- while (mostly) not as clued-in as Harry -- had much more info than Murphy!