I'd get 1/2" thread wheel studs with larger then needed knurled ends, get the proper drill and have the new studs pressed in. I would probably install right hand thread studs on both sides. Then but the lug nuts that fit the wheels. Put some dust caps on those bearing hubs.

Sure seems like a lot of effort for something your going to dispose of in the near future, but its your money and your ride. I'd just do the disc brake conversion now. Gene