In certain circumstances, you can glue wet leather. When we made surcingles at the saddle shop, we covered the handles with leather. We put glue on the steel handle and on wet leather. Then we molded and stitched the leather on, forming and stitching as we went. Lastly, we buried the stitches under the leather by molding it over with a hammer. The handles then dried overnight and were quite solidly covered the next day. That method only worked because the leather was held securely until the glue and water dried out. That could work on a belt with woven cartridge loops but only if you stitched or riveted the strap at the glue point. Then, of course, there would be no need for the glue in the first place.