Hello,
I haven't done this myself, but I've heard it discussed. Heat is the only way to go to get the epoxy to release. I would keep cool rags around the bottom of the pylons during the process to limit the heats exposure into the hull. It might take some time for the heat to makes it's way through the casting, but it should work. Maybe you would be better off giving a buddy some cash to borrow his hulls and frame for the race?
Good luck,
Jack Hoying
Fort Loramie, Ohio
Prindle 18 #1645
http://www.bright.net/~jmhoying/sailing/prindle.htm