Hit the local scrap yards, old big truck shops, or farms around you and look for original GM 2 piece ring lock wheels or 3 piece wheels in the same bolt pattern. They can be had for cheap ($400 for all 6 of mine) and then you aren't worrying about hub swapping. They aren't as easy to find, but they are still out there.
If you are dead set on getting away from this bolt pattern and don't want to spend more than what the truck is worth, then hit the local scrap yards and axle swap the truck to different axles with the desired hubs. It will be infinitely cheaper than purchasing all new wheels. Frame width is pretty uniform across manufacturers so other than brakes, it is pretty much plug and play.
