I think you can only share P1 time if you're both flying on FAA licenses. Not that getting an FAA PPL to do your hour-building should be a problem, just an unnecessary hurdle when you can fly a PFA aircraft in the UK, without having to worry about travel, accomodation, leaving your family, etc, for as little as £10/hour if you look hard enough, and £25/hour without having to look too hard at all.
FFF
--------------