Cool, adapting Toyota axles to the Jeep, using a doubler from DD Machine, D300 with split controls.... all you need now and brake controllers.
Have you thought of using the FZJ front diff with their electric locker? The rear would be offset to the passenger side, but if you get matching front rear axles, it would come as a full floater, beefy shafts, rear discs, and I'd doubt you could torque it with the doubler.
Why go that route over the infamous Danas?