What I am looking at is using a stamped steel stacking target (readily available, and cheap) and welding it to a turned flange that would fit the hub. I have some heavy wall (1") pipe that is the same OD as a deuce flange. I would cut it into 3/4" slices, face off on the lathe, drill on the mill, then weld on the stamping. About $200 worth of machine time to make a $28 drive flange!
As with any project like this, the material cost is usually not the issue, it is the machining time.
I'll see what I can come up with, I have all kinds of tricks up my sleeve.