Ramzi Fawaz ("The New Mutants") teaches at U Wisconsin-Madison English, and hails from GWU American Studies. He's also currently working on the new Keywords book for Comics Studies, co-editing with Shelley Streeby at UCSD (used to be Literature, nowadays Ethnic Studies). I know at UW (the other one, U Washington) there are several people doing comics work in their PhD - in English, and also in History.
Honestly, though, I'd take a look at the leadership and conference line-ups for ICAF and the Comics Studies Association, then trace who's teaching where, and perhaps email some folks. I say email because while it's easy enough to find who's doing the scholarship where, I think it's harder to figure out which institutions are best for funding international students, in those particular departments, so you may have to outright ask, or at least look at their admission statistics. Sorry to not have a more direct answer to your question.
Good luck!!