The 22.5" rims with 10 lugs on 7.25" bolt circle (like your old wheels) will have 5.25" center hole (larger than your original wheels).
Bushings can be made to solve the center hole problem.
Finding the wheels is the larger problem. I would not say they are rare, but they certainly are uncommon and take a fair amount of looking to scrounge up..
Your cheapest and fastest option is probably to find more original wheels that are not rusted. However from looking at other threads folks are having a hard time with that too, I'd suggest looking in the mid west for less rust.
Grigg
