Did you happen to see Be Cool? There were a number of pro bb's in there, and I'm pretty sure they were held to non-speaking roles for a reason.
However, I fully agree that somewhere, there has to be somebody huge that can play one of these parts. Markus Ruhl maybe? I dunno, but I mean, I'm not looking for Shakespeare-esque acting here, they just need to play a freakin' comic book hero, who if I recall, weren't all that emotionally or verbablly eloquent.