Do you have a saddle shop anywhere near by? Either they could make one for you, or get you some straps (or better yet scraps) so that you could make your own. If you want to get fancy, search for the ez stitch sewing awl and get it with the heavy needle.
Scott,
Google HERITAN and maybe TANDY. You should be able to order rivets and necessary punch from one of the two. From experience use more than one per joint.
Check ebay for leather and rivets too, you should be able to get scraps for nearly nothing. Rivets are fast, but I would probably go with stitching since you should get a stronger piece. Either way it will look nice. If you go with rivets see if you can get copper because it would look nice.
I was going to recommend a shoemaker, but realized that on my side of the pond, that's what we call cobblers.
Ironically, when I needed new straps for a briefcase my wife had had made at Harrod's in 1970, I took it to a quality shoemaker. Or cobbler. Whatever the name, he had the fasteners at hand.