The main question is can he be angry and constipated enough to play Vegeta? I mean Wolverine was an angry fellow, but Vegeta was so much angrier.
Very true. I read in a magazine that interviewed him that in order to play Wolverine properly, he had to take cold showers every morning so he would be angry enough xD
Cold showers and the couch for the time it takes to shoot the movie should do the trick