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@Mr_Bump
Check out the Sheldon Brown web page about removal of freewheels by destruction.. http://sheldonbrown.com/freewheels.html#disassembly
Sounds like the threads have melded onto each other similar to a seatpost/frame situation (Steel threaded freewheel body onto alloy hub)
You cant use the ammonia releasing method as it's the alloy hub bit that you want to save but have you tried any direct heat with a mini blowtorch and the use of proper penetrating oil which should be your first port of call before heavy handed vice applications.