Since the lower tube that bent has an actual crease in it, I would try wrapping a sturdy ratchet strap around it as well as the downtube and start ratcheting it down. I think the bent tube will give before the downtube does, possibly putting it back in alignment or at least close. (At your own risk though) . If you know anyone with a fork straightener, they could jack the straightener while you ratchet the strap, possibly alleviating the stress at the headtube simultaneously. As for the stem, I'd just hack the fork at the bottom of the steerer tube and weld a new steerer tube on. Then you have a straight tube and you can cut the old one from around the stem if you really want to use that stem. But if you don't care about the stem and don't want to weld the fork, cut the stem off at the headtube and use a 7/8" spade bit to chew the stem remnants out. You will ruin a $2 spade bit but your fork will still be useable