Have one now
MAC : I got one of the hubs NOS for $8.00 + shipping last week off e-bay. The point was to run a thin sprocket on one side and a brake disc on the other side so the wheel would still be looking great.
I will keep looking. Steve
Scooterboy might be able to hook you up with a hub like this below(Both sides of hub is pictured) to attach a disc to the one side of the rim.
.
.
I will keep looking. Steve