Are we really talking 'freewheel,' or are we perhaps talking a cluster? If it's freewheel:

Unless I'm missing it, you're not clear about which part is damaged. I'm guessing its the threads on the hub, since those are aluminum and the freewheel body is steel. You don't say how badly the threads are boogered up.

There might be a shop nearby who will be able to chase the threads with a die. However, having said that, if you unscrewed the freewheel to get it off, how bad is it, really?

And if they tried to pry it off hard enough to damage threads, I would also suspect a cog or two on the freewheel might be bent, no?

Easy enough to replace a freewheel, but if the hub is damaged, why not scrap the wheel and move into the modern era. Get a new wheel with a 'freehub' with the proper spacing that takes a 'cluster?'

If it is already a freehub situation, and the threads that the locking screws into are messed up, I'm guessing a shop would have a tap for this and could probably do a repair.