i personaly think that if puchs can rock spoked rims (granted the dont have any special spoke tighening devices or thick walled rim) and they definatly dont have 100 spokes. you should be good.
the only i would be worried about is the disc getting ripped off if you grabbed the brakes really hard from the force of (~90lbs. + ~160lbs.) the moped and yourself going 50 is going to be pretty hard on the discs.
i would see if they look _kinda_ weak. and see if there are anyways to strengthen them.