The problem with pants belts is what happens when the pack belt presses against them.
The solution is to use a pants belt that has as little thickness as possible, and then use a sidearm pack that is open at the front, so there is nothing that presses against the minimal pant belt and your gut.
I’ve hiked with this arrangement for decades, and the comfort has dwarfed anything else, and kept me backpacking comfortably. The only concern was the weight of the sidearms, and that has been greatly reduced by use of Easton .340 alloy tubes bent to shape, an approach developed by Roger Caffin with his “Rolling Jenny” tube bender. Will post when the latest design, with an hourglass-shaped frame with a suspended mesh backband , is completed. The latter has been developed by LL Beam and Osprey, among others, and the key is to allow just enough stretch in the band to allow the wearer to bend over., but keep the weight around the hips when standing up. Osprey sometimes missed the boat on that one, but not Beans.