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@Steff
My suggestion, for what it's worth, would be to buy a nice frame from the classifieds here and build that up. FWIW, a 4mm change in rear spacing is nothing much - a lot of frames will be out a couple of mil either side anyway (ideally symmetrically, but not always).
If you want a singlespeed, I'd just buy one of those vestigial-derailleur things (singulator?) and not mess about with "magic" gearing.