Once you remove the old drum by drilling or grinding the rivets away, it's not really necessary to re-rivet the new ones. If you want to hold the drum and hub together, just tap the rivet holes for flat head machine screws and countersink the holes so the screw heads are flush with the surface.

"It is better to be silent and be thought a fool than to speak and eliminate all doubt!" - Abraham Lincoln
Cringe and wail in fear, Eloi- - - - -we Morlocks are on the hunt!
There is nothing noble in being superior to your fellow man; true nobility is being superior to your former self. - Ernest Hemingway
Love your enemies and drive 'em nuts!