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@eggpie
Caustic Soda will dissolve anything aluminium, but not steel. (Also paint, skin and potentially your cat if applied incorrectly). Drill/cut away as much as possible, and just soak it, or fill the seat tube. Be creative.
Theres a good guide here:
http://www.classiclightweights.co.uk/seatpin-rest.html
As for cranks, have you tried a ball joint puller? If you find the right kind, you can get much more force applied to the cranks from the back instead of the relatively weak threads..