Our esteemed List Meister suggested "In this case, consider cutting off just the top "curved in" part of the seat post, inserting a steel rod which is as close to the? internal diameter of the remaining hole, then turn frame upside down and clamp now-reinforced seat post top in a big vise."
Now, far be it from me to compare my meager experience to Dale's (Especially after relying on that tremendous fount of wisdom that he has so often generously shared with me when I was in trouble), but I would urge this; Use brute force only after all other methods (including soaking it for a month or so, if needed) have failed. They all really do come out, eventually. I thank Karen Rawls for teaching me this lesson. I actually have torn a seat tube open at the slot for the clamp doing this! Tremendous leverage can be exerted in such cases and this is not thick tubing we are working with. Same for a stuck stem, it is tempting to be a Macho Man and place the wheel between one's feet and, using the bars for leverage, twist that S.O.B. right out of there! Well I can tell you after a trip to Doug Fattic's shop to get a bent fork straightened that there are better ideas (especially patience) that can be brought to bear.
Brute force is really a last resort on dealing with a bike, anytime.
Now as to this originality issue in judging bike shows. Perhaps there should be Show Bikes and Riders and the various rigorous assessments of originality should be more heavily concentrated on the declared Show Bikes and realize that Riders are for riding, and that the owners just want to share what a nice bike they have rather than submitting to what is, more often than most judges care to admit, a darned arbitrary view of what is original and what is not.
Braced for the flack in Lansing Michigan USA
Tom Sanders