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@Matt_B
you have crossed a few different terms and thier meanings in your post...
does the hub have threads on the hub shell... which are there to take a freewheel..
or does the hub have a seperate free hub body with slots along the length to hold the cassette in place?
If it is the later... there isn't much you can do apart from buying a surly fixxer, which are pretty expensive and not really worth the cash, especially when you can get fairly decent hubs for the same price.
if it has threads for a freewheel.. you can put a normal track cog on followed by a bottom bracket lock ring to hold it in place. Extremely sketchy and not reccomended. It is known as a "suicide" conversion for obvious reasons. There are no guarantees that the thread is deep enough for both a cog and a lock ring, so is prone to slipping, even with plenty of loctite.
The other problem you may face with both set up's, is the chain line and the wheels dishing. search sheldon for more infor on that.
Best bet - buy a new rear hub, will save you lots of money and headaches in the long term