Your idea of the PB Blaster is a good one. I would not try to drive it down from the top. As you said there are flutes on the upper end neat the head. I don't think you would be able to drive them down through the hinge, it would just get stuck for good.
Some heat from a torch is a good idea also. How tight are your hinges? If you have some slop you might try having some one lift up on the door as you try to drive the hinge pin up and out. Just a thought.
Use a punch just a hair smaller than the pin. With a little patience you'll get it done.
George
