So I'll guess you still have left hand threads at left rear, 7/16 studs left and right rear, thus different lug nut sizes front and rear. A pair of adapters would solve some of it. One spare and one lug wrench at least. Then you would never want to use that OEM bumper jack to change a flat anyway so...
I have 2 small bolt/ drum brake cars and haven't switched to big bolt disc yet. The Dr. Diff axles sound like the way to go. I'll have to keep those in mind if I convert.