Rear disk for 8.75 with SBP?

The Mopar Action articles are about adapting Liberty/Grand Cherokee rear discs onto factory LBP rear ends, or SBP rears (A body 8 3/4) with aftermarket LBP axles.
I see a couple of potential problems you'll need to overcome:
1.) The small bolt axles have a different offset than the large pattern axles- the large pattern axles protrude approx. 1/2" (IIRC) farther out of the axle tube than the small pattern axles. This is why you can't run stock SBP drums and backing plates on aftermarket LBP axles. For this same reason, the Liberty/G.Cherokee discs are designed with the greater offset of the LBP axles. They bolt on to the legacy LBP rears; but the "hat" of the rotor is too deep and will set the disc too far to the inside, interfering with the caliper brackets on SBP axles. If you found a rotor with a smaller offset, it could work- but then you'd lose the parking brake.
2.) The center register is considerably smaller on the SBP axles than on the LBP axles, which could allow the rotor to "drift" on the axle flange, especially under aggressive braking. You don't want an off center rotor. This could be remedied with a spacer ring, but then you're back to issue #1.
Honestly, the only way I can see this working is by redrilling the rotor to SBP; and using a (1/2"?) wheel spacer between the axle flange and the rotor, which would need a minimal large center register to locate the rotor, and an additional SBP register to locate /center your SBP wheels. That would require longer wheel studs but should allow the parking brake to remain functional, too.
Good luck!