You could take the Core skills for this. You've got provoke and rapport. Provoke is anything that is intended to provoke a feeling in someone else. Doesn't really matter which, angering someone would be done with this just as much as flirting. It's the social attack skill. On the other hand you've got rapport that's more like the social defense skill. It distinguishes mainly between how you actively make people feel towards you and how your general behavior makes them feel towards you. Empathy still exists as well, I think, but it's more of a social notice.

I thought self inflicted stress ignored armor?

If it's not adding anything to the character - basically, from what you say it's just letting him cast spells normally - I'd say it costs nothing.

I'd allow him to take sponsored debt if he wants to get some extra bang for his buck.  This costs nothing because in return, he'll have to take compels, so it's a +/- 0

Any actions that break his tie with the Ley Line(and prevent him from spell-casting) would be a compel on his High Concept based on the fact that magic is grounded out.

Attuning himself should be some kind of challenge where partial success creates lots of complications(maybe he's limited to how much power he can call up - or maybe faces some kind of threshold against his spell), failure prevents him from casting, and full success allows him to cast normally until someone/thing does something to break his connection.

Page 292: Places of Power

At least that's what it sounds, like to me. Rather than having to be at a specific place it might be another condition that has to be met, but it costs -3 refresh rather than the -4 refresh of other sponsored magic, and if you have evocation and thaumaturgy it only costs -1. You could take it as a temporary power for 1 fate point per scene or pick it up for refresh as long as it is needed.