Pitt or Clooney? What a laugh!!
However...what about Alan Rickman? Yes, he's 62, but he looks (and can be made up to look) a good deal younger, and Harrison was 55 when the film was made, and that's how most people see Higgins - as a man in his 50's, not the 40-ish that Shaw says he is. Or if not Rickman, what about Daniel Day-Lewis?
And who/what will they look at for Pickering?
Sarcasm is an allergic reaction to stupid people.