Steel wheel rusted to hub.....

Checked the search for "wheel stuck" and variations on removal and found a lot of stuck brake drum threads but I have a slightly different issue. All 5 lug nuts removed and the steel wheel is rusted to the drum/hub. Been trying "percussive maintenance" along with PB blaster and dropping the car on the wheel with no lug nuts, etc. but will not budge. (Car does not run, so can't use the drive methods to unstick it). This wheel was near a plumbing leak and it was rusted pretty good. I got it free to rotate, but not come off the car. MAP Gas heat maybe? Heat the wheel to hub connection? I will also try some more percussion from the inside and outside and increase the hammer mass....Other ideas?