Does anyone have suggestions on how to deal with a very badly rusted keel winch on a v24?

This thing is so badly rusted that the teeth are quite literally disintegrating, It will not move at all.

I have tried soaking the nut on the barrel bolt with PB Blaster several times with no success.

I will try heating it to cherry red today but I think that it will be a futile exercise. I believe that the only hope is to cut the nut off and try to drive the bolt out of the winch barrel. I do not want to damage the 1/4" ss lift/lower cable as it appears to be in pretty good shape at this time. The problem is that the keel is resting on the trailer making trailer removal a bit of a sticky wicket.

This is a 1970 model v-24 that has been sadly neglected for many years.

I just finished gutting the cabin and the next step is to get her off the trailer, but that can not be accomplished untill I am able raise and secure the keel to take he pressure off of it. I am trying not to create any more problems/damage than exist already. Thanks in advance for any suggestions.
