"There are horror stories about chickens eating superworms whole and them chewing their way back out of the crop..."
All I can say isI'd never heard of this.
Yeah, I've seen it a few times, not seen the superworm come out of a bird, I have actually never owned either, but I have seen the stories a few times, and I figure it's better safe than sorry especially since they are so tropical that killing them is easy, just toss them in a Tupperware with a lid, toss in some bran, and put the whole thing in the freezer for a few hours, the bran keeps them from sticking together...