It has been mooted in discussions about making a fixed disc hub - take a fixed/free hub and screw an adaptor onto the freewheel thread. I don't think anybody has gone in to commercial production, but it would be a trivial task for any ordinary machine shop to make one. Just a cylinder of metal with a female 1.370x24 thread and 6 equispaced M5 holes on whatever the ISO PCD is. Screwed on brakes are known to work, it's common practice on tandems.
It has been mooted in discussions about making a fixed disc hub - take a fixed/free hub and screw an adaptor onto the freewheel thread. I don't think anybody has gone in to commercial production, but it would be a trivial task for any ordinary machine shop to make one. Just a cylinder of metal with a female 1.370x24 thread and 6 equispaced M5 holes on whatever the ISO PCD is. Screwed on brakes are known to work, it's common practice on tandems.