x2, you can run it without isos added to the rear but they will top out ocasionally, i did it for a month when UPS lost my rear shocks with my order. then threw them on another KJ that needed them as they were only 5 months old.
If you add the 2 extra isos it will top out even more, limit flex etc but will still be drive-able.
plus then you get to appreciate what your new shocks add to the package when you replace them.
I'd set it up how you want it, drive it, and deal with the clunks for that short of time.