I asked about solid, non-clamping hexes awhile ago, and never got much response. The people that did respond didn't understand why anyone wouldn't want clamping hubs.
I machined down some super wide ones I got when I was running an antique Yok sedan. But I need some 4mm axle shims. Really, there is no reason Corally couldn't release these hubs in a non-clamping version. Heck, it'd be CHEAPER to make them that way. Leave out the machining and drilling/tapping steps, and drop the cost of the bolt. Less time and fewer manufacturing steps means Corally makes more money on them. Or Speciallized RC could make them. HINT HINT Jeff!