The simplest way to do it is to make it to start with the Power Option: Spell from p308 of The Paranet Papers, granting The Living Dead power; this makes it a 0 point Power, but granting Lawbreaker(5) if you use it.
(Once made Living Dead, healing them should be comparatively easy, by the rules - unlike the books).

This book pretty much killed the series for me and serves as an end.

Yeah, this. mostly because of character action causing me to lose interest/respect in them.

- Murph dies, removing her form the series. Annoying, but - becoming a valkyrie undermines both her shown religious beliefs and her refusal to sign on to any of the powers to be healed.

- Dresden threatens One Eye 2nd hand if he mistreats Murph...after failing to avenge her while on the spot. Blow hard.
- Gard fails to call him out on this.
- twerp who murdered Murph justified it by calling her a terrorist, so no doubt will be promoted, not punished, given the mortal decision to call the trashing of Chicago a terrorist attack.
- sword that broke rather than let Murph try and save Harry, is happy to kill Harry rather than let him avenge Murph.
- sword wielders would rather 11 million innocents die that permit the punishment of 1 murderer.

That's *one* plot....

Marcone was interesting because he was the vanilla mortal who could stand equal with supernaturals. Now he's just another coppertop.

Thomas, the schemer, just buckles to blackmail. Not, for example, waltzing in and saying "hey, I'm being blackmailed to murder you, what say you pretend to be murdered and throw me in a cell" or something similar. Justine's now full villain - when the smart thing to do, given she would probably die from child birth, would have Alfred toss her into the same cell as Thomas so that the kid can't kill her. (So finding out about Nemesis *after* already locking Nemesis up).

Molly goes cackling witch.

Ramirez goes whinny teenager.

Ebenezer's response to "Oh, I didn't kill you in a fit of fury?" is indifference.

The most significant character I still care about is Mouse. My biggest question at the end of the book was "where's Mister?" (With the Carpenters, apparently. Who I stopped caring about due to the worthlessness of the entire order).

Haven't had a Dresdenverse campaign reach this level, but learned in other systems: niche specialization is more important that raw power. The wizards niche is solidly limited by the laws of magic, so understanding/manipulating/killing people belongs to the rest of the group. Notable that the restriction on transformation limits the usefulness of magic for disguises as well.

At the levels you are playing at, opponents are typically going to be smart and skilled, so should be researching PC weak points. Since the wizards are the most powerful, they will be the ones planned against.

Given the nature of the system, it might make more sense for the players to simply use the wizards as 'guns' and channel efforts through them. The fire spell does most of the damage? Fuel/air mix provided by Resources can enhance it. Social characters cheer the wizard on. Stealthy PCs act as artillery spotters.

I'm guessing you've already thought of most of this, but if there is even one thing I've included that is new, it's been worthwhile.

If wizards only live for ~500 years, and Mab was old at Hastings, no.
Remember the starborn are having to 'hang on' to still be around at ~700.

The story takes place during Changes. Ivy tells Kincaid to shoot Dresden in the chest or she'll come for him. She did that so that Harry had a chance.

Yes, but not 'a chance'. She's the Archive. She would know how Mab and Boney would respond.

Still, it makes me wonder at the mechanism behind the Wamp's clothing.  It's like it's enchanted in smart cloth that obeyed Lara's presumed mental command (attacking the enemy) even after being detached.

Well, if it was flayed from someone/thing that was under her control, the enchantment would only need to handle movement. Possibly strip away the humanity from a rival vampire, so that all that remains is a mobile skin?

Good questions, but also:

Can a mundane put a magic circle around their techie toys to protect them from visiting wizards?

Via two completely different family trees which makes it quite likely that both are invented. We can make a nice family tree that links Butters to Jesus and Maria Magdalena, the favorite woman for this purpose. Or Jesus brother James if you want to. No problem.

If they were inventing stuff, they'd have simply deleted one of the inventions to keep the story straight. It is real history that doesn't make sense.

Mary Magdalen doesn't get the 'woman of loose morals' shtick until the Middle Ages, so no.

Jesus' 4 brothers, and unknown number of sisters (minimum 2) are a serious option though.

 Grandsons of Jesus' brother Judas were taken to Rome by the Emperor Domitian, and then sent home.

 Eusebius of Caesarea's Ecclesiastical History records family members (referred to as Desposyni) as still being around when he was writing in the 4thC AD. Given how breeding works, we're probably all descended from them by now.