It could have worked - if Khan's second in command was revived instead of Khan. He looks a lot like Cumberbatch!
JEDIT: Now I'm retconning STID to actually star this guy, who only pretends to be Khan after the suits at Starfleet unfreeze the wrong guy. He plays along because he wishes to avoid being put back into hibernation, and soon comes to enjoy impersonating his hero so much that he begins to think that he is indeed Khan.