Some potential solutions for the waist strap.
1) Buy a nylon webbing strap with an SRB like this - https://www.rei.com/product/848428/r...s-package-of-2 . Make sure it's longer than you need. Cut it in half, melt the ends with a lighter, and install on either side.
2) Remove those buckles (a hacksaw blade does nicely as long as you're careful not to catch the webbing or the bag) and then you have the loops with which to use a strap that has Gatekeepers, assuming the width is a match.
3) Scavenge webbing and buckles from somewhere else and make your own strap.
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