Unless you can find a way to hold the hub by the flange closest to the freewheel, chances are you will destroy the hub either by crushing or twisting the spool.
If the cut spoke ends are still in the hub, I might try bending them all over so that they all form equal length loops. Then attach short spokes to them and lace that into a rim. don't cross them, just arrange them so they all pull in the same direction, and they will all load up pretty equally when you turn the rim to spin the freewheel off. Of course, you might end up with bloody knuckles, a ruined the rim, a bunch of useless short spokes, and still not get the freewheel off.
OTOH, that hub must be 25 years old. Maybe it's time to retire it.

em