Way back when, when I was working at a bike shop, a kid brought in a Trek that his mother had run over with her car. The kid was so upset and thought he would have to find another bike, but had no money for one. The seat stays were pretty mangled and the rear wheel was toast. I took the rear wheel out, stood on one seat stay and yanked on the other one. With just some brute force and leverage we aligned the bike in just a few minutes. The kid was estatic, he couldnt believe we could fix his bike so easily. Sold him a cheapo rear wheel and sent him on his way.
I think you can find some sort of leverage point and bend that frame back to straight. No big deal. Go for it.