You know, I can't see any reason not to allow it, since I already allow "Character & Any" which has just as much (or more) scope.

It would come with the risk that you'd get e.g. Biggles & Algy fic, but (as this is a pretty small exchange and most people in the exchange know each other) I expect there is a high chance that anyone who's offering it would also think it would be fun to write for the lesser-seen members of the squadron as well.