I was thinking the other day of the ideal cast for a movie of M*A*S*H, based off the television show, not the movie, and the one person who I thought came across as the perfect Henry Blake is Jim Carrey. I mean, if you watch the show, a lot of the things you see Blake doing, with a little bit of imagination, you can also see Carrey doing. Blake was the lovable, goofy commanding officer of the 4077th on the show. And although Jim Carrey is probably a little younger than McLean Stevenson when he played that role, I still get the feeling he could pull the character off perfectly.
Far as I know, no remake of "M*A*S*H" is in the works, but if it's ever in the process of being made, I'm certain Jim Carrey would be the best bet for Blake.