I solved it by using cannulas. They are made from stainless steel, and solder won't touch it. They were thin enough to separate the pin from the through-hole. It still was nerve-wracking. That was my main machine I was working on, a nearly prototype Amiga 1000 that had cost me a fortune.
Am Here do that all my spending is into projects gonna buy a Vetter one soon tho cuz i need to möge a resistor on a 0 w to allow sautering in a ufl smd