Thanks, darling! I think alien!Dean and Gabriel would get along (maybe too) well and half the fun would be learning that some aliens weren't so different from them as humans. And Cas getting caught in the middle, as though that wouldn't be funny? :D

You hit the nail on the head: as long as Gabriel still has those qualities, he'll work in any 'verse -- unless the purpose was a mirror!verse, of course, then maybe he'd be something more like Gabriel in Constantine or The Prophecy.