Some free ( probably worth the price ! ) ideas to Chris Vandiver :

I'd hang the plane by the end of the blade so that the entire weight of the plane was suspended by it. Then I'd tap litely on a twice daily schedule on the heel of the plane with a firm but lite stroke. If it didn't give in after a week, I'd add more weight to the middle of the plane mouth by using coat hanger wire and a couple of small barbells. Repeat lite firm strokes. If it still didn't give the blade up, I'd wrap the mouth area with some tin foil and then use a torch to dry the mouth area as much as possible with out burning or harming the plane body. Of course, this would be a risky play but the idea is to remove any moisture from the wood by a slow bake and not a burn.

Feel free to laugh. The ideas are priced right ! Hoot !

Good luck.