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Old post but I've done something similar and ended up using the outer position on a triple. I can't remember the numbers but the chainline was quite wide, over 50mm I think. I can measure it tomorrow if you like. Fair warning: haven't ridden the bike in anger as I've been away over Christmas so the chain could well end up grinding or popping off or something; who knows.
If you decide to buy a cog the cheapest one I found was this from Triton
So I've got an EBB mtb with vertical dropouts and a spare 6-bolt rear wheel.
Is the chainline from a flipped rear wheel gonna be close enough to a chainring in the outer position on a HT2 mtb crankset to have some 6-bolt off-road fixed fun? Quick Google looks promising...
Anyone got a 16t ISO bolt on cog unwanted?