Just have them show up twice.
Yeah, I'm not liking the sound of this. That's a whole lot of effort and research and decisions, it sounds way too complicated. Look at Anh Hung Tran:
* born in Vietnam, made a number of movies set in Vietnam, with Vietnamese actors speaking Vietnamese
* however, those films are usually French productions, or partially France-funded
* I Come With the Rain
is a joint France/Hong Kong/Ireland/Spain/UK production
* Norwegian Wood
is a Japanese production
Do I have to list him under all those countries? Should I just toss him in the Vietnam box because he's Vietnamese? I don't want to make those type of calls.