In regards to the AA and making it so people can't use their real armor.
Honestly if plot is looking to "break" a heavy armor build and not allow them to use those skills in such a way, I would not go to that chapter again.
I'd rather have a theoretical 5 point AA hit me and not use my armor for the rest of the game than get obliterated. Plus, you could always refuse it or find a Destroy Magic. Not being able to use armor until fixed is way less character destroying than transforms, DMing your items, shatter spirits, etc (in my opinion).