Well, I saw Alan in "Cabaret" and he had pretty extensive makeup in that--he was shirtless for most of the show, and wore pale, almost corpse-like makeup all over his body with heavy needle track marks all over his arms. In one scene he shows up in drag, and at the end of Act 1, he moons the audience to show off a swastika tattooed on his backside.
As you can tell, this was not a family show.
But I agree...he had to at least have some idea how gruelling that makeup process was going to be when he took the X-Men part, since I'm assuming he'd seen what the character looked like before he took the role. You can't really feel
that sorry for the guy.