Beadman, winged elm is just the stuff you want. Good as any. I use a lot of what I BELIEVE is Russian or Siberian elm, just because it's everywhere. Not very hard, SO scruffy and fibrous. It will make a bow, but doesn't split, cut, rasp, shave, or shoot like the better, hard white elms.
"I was mostly worried about compression and wondering how to design for it." If you are worried about compression, leave it wide.
Elm with a low crown doesn't seem to strain the belly lots more than a high crown, esp if you give it a little trap at the sides, too. It's just that the low crowned back isn't any better at not breaking than the high crowned back. If that makes sense.