If the South Park characters did a version of Cannibal! The Musical, who would play who?

I think (you can argue me on this):
Stan = Packer
Wendy = Polly
Kyle = Humphrey
Cartman = Bell
Kenny = Swan (he dies first! lol)
Craig = Miller
Butters = George

I don't know who would play the trappers and other characters. What do you think?