You should be able to swap to 8.25" wheels with no problem, which should be easily found at truck junkyards. The wheel width really determines what size tire you can run (and vice versa) so you wouldn't be able to run anything smaller than a 10R22.5, and if you moved to an 11R22.5 you'd be better off with the 8.25's anyway.
Swapping to hub piloted wheels involves actually changing the hubs, which will have (on the front) alignment "tabs" to center the wheel, the rear will have something similar around the outer wheel bearing, so it's not just a simple stud and nut swap. It's a rather complicated and expensive solution to an otherwise simple problem.
You could go on and find some nice aluminum wheels while you're at it. No reason not to. If you mix and match steel & aluminum on the rear (yes, it's a common thing in the trucking world), be sure to get the plastic spacers that go between the wheels to prevent galvanic corrosion.
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