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What about a wide foot sprocket? Should in theory prevent the sprocket from digging into the softer spline...
wenzovic-
That would slow the destruction, but you're still using the expensive and hard to replace hub shell as the sacrificial element. Aluminium free hub rotors are cheap, easy to replace, alternate loading over the full width and don't experience load reversal, but manufacturers still consider it a benefit to add steel inserts to slow the inevitable destruction.
gbj_tester
Mack has the same mounting face spacing as the 110×20 hubs, lines up with track cranks but not brakes.
Effigear seems to be an aluminium HG spline cut straight into the hub shell, there's no way I'd use that. Even a threaded sprocket would be better.