Mike I figured out a way for you to convert your 3/4" spindles to 4 lug hubs. I saw these in Atwoods the other day. 3/4" to 1" top link adapters. If welded to the spindle backing you would gain strength and rigidity. Could be pinned on if welding is not an option. Then a 1" to 1.25" adapter for the seal to ride on like I did.No need to apologize, quite the contrary! I'm just trying to clarify your suggestion.
I do think that these spindles are probably undersized for using a JB Jr.