I think it would be easiest to separate MCU into MCU Movies, Agents of SHIELD, Daredevil, Jessica Jones, and Agent Carter. That way, the tag list isn't quite so overwhelming.

For instance, I know I personally would only be able to write fic for the movies and Agent Carter. The thought of having to sort through all the possible pairings for all the other tv shows to figure out whether the ones I am interested in offering or receiving are nominated fills me with dread.