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@arnold_gostron
The "fixed" and "free" sides of the hub differ in that there is room for a lockring (which is smaller and reverse threaded) on the fixed side.
As a general rule, you can thread a freewheel on to the "fixed" side of any hub - i.e. you can run a fixed/fixed hub as fixed/free or even free/free. The reverse is not true as you cannot fit a lockring on the "free" side of a hub, so if you were to screw on a cog (which is possible), there would be nothing to prevent it from unthreading when you applied backward pressure to the drivechain.
I guess what I'm saying is, a fixed/fixed wheelset would suit your purposes just as well as a fixed/free. I don't have one to offer you, though.