'73 Disc conversion, but keep 4" bolt pattern

Thanks for all the input...I think I'll try to convince him to swap wheels. He's emotionally invested in the wheels since they were so hard to find back in the late '90's. Not much in the way of choices for small bolt pattern back then.
The 4 different wheel route will require a pair of 5 on 4 to 5 on 4.5 adapters at the rear ( 60 dollars @ ebay ) and a total of 20 new lug nuts, a different spare wheel and a different lug wrench. Carry 2 lug wrenches or a 4 way incase you should need to get one of the adapters off on the side of the road. I know, everyone carries a cell phone and a AAA card today except me.
A positive note... There will be a buyer for those 4 small bolt pattern wheels. There's a buyer for most anything you pull off or don't use.