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@hoonz
I removed a siezed post once.
Drill a largish hole through near the base of the post.
Fit a long 3/8 socket extention through it (a screwdriver will be too flexible)
Lay the bike sideways on the ground and using wood and sheets/blakets to protect paint and brightwork
Hit extention end really hard with a large ball pein hammer, thereby twisting it in the seat tube.
Should take no longer than an hour all up, no damage to paint, no nasty chemicals, no waiting.