It's kind of a strange thing to think, recasting. You'd have to consider just what the heck is the "idea" separate from the performance, consider who would do that idea better, and how that would play in with everything else staying the same and therefore how it came about.
Like, what idea was so good, rest of the movie such that you cared to "fix it", and the actor would have been better with someone you can think of in the removed abstract? Def not my strength. Especially when I try to "think of something" all I can think about are those performances which are iconic in my head, and can't be recast.
But if I were making say Final Fantasy 6 into a movie, and I were casting people in this thread, Danjuno would be Edgar, Amadeus is Ultros.