Can style feats function in armor? I don't see anything in the Style Feats section that says otherwise.
They definitely can. I don't see why they wouldn't.
I thought as such.
The only exception I would see is say a Master of Many Styles as fuse style replaces flurry of blows. Armor zaps a monk's ability to use flurry, monk AC, and fast movement, so I would guess that it would also prevent an archtype monk from using an ability that replaces flurry of blows.
Pretty sure an archetype only retains restrictions when it says it does or its modifying an existing ability, rather than when replacing one entirely.
Hrm, that gives me an idea in a game of mine then that also allows 3.5 stuff.