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41 and 46mm chainlines, right?
More like 40 and 48. If you're going for that, a 100mm hub as a starting point plus a 5mm spacer between sprockets gives you 41.5 and 49.5 chainline at the wheel end with 3mm thick sprockets, so if you want to be exact you actually need to move the hub to the left by 1.5mm. That adds dish, but still not as much as a road hub.
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Hmm, I was merely quoting the Velosolo suggestion. Easy enough at the hub end but if it doesn't match at the front it sounds a bit like a faff.
Some of use would like a road crank for their fixed wheel! I know that the market would be tiny so I can appreciate that even if you have a friendly CNC workshop you can go to this might not be very viable.
I have a 130OLN frame on its way and I've been considering going for a Velosolo dingle plus road double (41 and 46mm chainlines, right?), but that's for another day...