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@TheShipwright
I guess with all mechanical methods of removal success depends on the level "stuckness". I've seen some on youtube etc where a set of stilsons was enough to release it.
I had a Kona PW which had a stuckpost and I tried all the usual stuff, WD40, boiling water on the steel seattube and twisting an old saddle on the post, amonia etc.
I also tried cutting the top of seatpost to get a flat surface and whacking it downwards a few times with a sledge hammer (full force not tapping it) hoping that a sharp crack would be enough to get it moving but no joy.
In the end, I clamped the frame in a vice, drilled the seatpost and put a really sturdy nut+bolt through the hole and then levered the post with 4 ft sash clamp and a scaffold pole for an extension and bounced on the pole and gradually increasing the pressure as I got more confident. It took a lot of force and when it went it made a real crack! This was a welded chromoly construction frame (the same as a Pomp) and could take the stress but I doubt a nice lightweight brazed frame would.
Next shit frame I get a stuck post I'm gonna have a crack at the home made reamer.