Just learned about these cogs: http://tomicog.blogspot.com/ that bolt onto the disc side of a hub. Will these work with the stock monocog hub to give a proper chain line? Any other issue with these?

Cost for two tomi cogs = $70

Cost for rebuilding wheel = $125 + $50 cog/lock ring + $? new freewheel for the new hub

If this works seems like a much better option.