Hmmm. This could be difficult.
The ultimate would be to find a rotor/hub for my spindle that would have the 10 on 11.25 lug pattern... But I doubt that is going to happen.
Unfortunately, I do not know of anyone that makes an adapter from 10 on 7.25 to 10 on 11.25.
On another note: Anyone interested in a disk brake rear end (10 lug on 7.25" BC)? I also have 19.5" powder coated wheels