There is a company out there called Trail Worthy fab (TrailWorthyFab.com) that will recenter H1 wheels with whatever bolt pattern, and nearly any backspace you want.
I have looked into these, and here is what I have learned.
While a great price for wheels and tires, they are 16.5" wheels, and tire choises are fairly limited. You can run Military OZ wheels, but will ride rough on the lighter weight H3 vs an H1 and the radials are only available in 37" tall, you might be able to find some 35" bias tires in a 16.5. There are some Super Swamper/Interco tires still available in 16.5. Second, they are very heavy. So much so, that even an Alpha truck would notice the weight difference. Just about forget an I5 truck.
I placed a set of my buddies H1 wheels on my 3T once with some hub/lug adapters just to try it out, and there is a noticable difference in driveability. The get up and go, and please stop definitely were effected.
I havent ruled these out yet, but I am not convinced its a way to go just yet.