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Bolt on derailleur hanger https://www.sjscycles.co.uk/gear-spares/shimano-compatible-rear-gear-hanger-bracket/
Sram wireless, no cable bosses
Push the rear triangles aparty for more spacing. It's fine with steel
High bottom bracket - does that matter?
Drill holes for rim brake calipers, or braze on some disc brake mounts.
I concede that it would be rather perverse. But I would do it, just for fun
Dripping with quality. Seller describes it as 'track/fixie', but what's to stop it being a road with derailleurs?