This is why i say engine drive! Lol anyways just strip it down the best you can, and use scrap steel and sheet metal, and soaking wet wood to shield the rest. Spray it with water if it's getting hot as you go. If you have to be super precise get the biggest welding touch tip you got. Just heat it up a bit, let it cool a bit, heat it up more, slowly stepping up the heat so you're not gonna crack anything, and help soak the heat thru the parts. Get some regular old paraffin wax that you would use for canning, and just dab it on the joint from time to time during this process. You can even get a bolt for a drift and weld some bs handle on it, smacking that from time to time helps wick that thru breaking up any rust and lubricating the parts. At some point during this process either the parts move or they get destroyed, but usually with some effort and time and the right tools you can get it.
If a press is really hard to use i would revert to my wedges. Go get some leaf springs from a junk truck or car and make yourself some wedges, sharpened by simply grinding them to a very long slight taper then quenching by splashing water to harden them. Then you can beat them in tight spaces with a sledge, just like you would a tree, using several to spread the force so you can keep beating, and to help keep it in alignment/ work it back and forth to help break it loose. You can use shims to help pad surfaces, and to step up the process as you work it free since wedges only work over a short distance.
Moving up the escalation ladder depends on your equipment and skill set. You can destroy the pin, aka lance. You can also cut off the bushings, if you notice those are usually welded on. You can also cut it apart anywhere else you think you can rejoin it, and then simply use a good shop press to help get it apart. Safe to say all of these are squarely in the if you gotta ask you better not camp. You can also just price out the new parts and just torch till you get there, then bolt up new, which honestly is likely the best course. Good luck man, just work slow and think of what could go wrong, and keep some extinguishers close.
