In the mid 70's, I picked up a THIN Indian Ridge Traders Knife Blank where the 3 to 4 inch long rectangular "blade" had been hardened and annealed, but absolutely nothing done to shape it like a knife. Grandpa had given me a home made "snag" grinder and I planned on using that to grind it to shape before using files and emory cloth. However when I got it home, I was kind of scared to grind it on both sides as the blade was so thin. So I hollow ground it kinda deep on one side only and took a LOT of passes and dips into water to ensure I didn't get it too hot. Man was that knife sharp and easy to sharpen and still held an edge pretty well.. I put the flat side down on the muzzle and it made short work of patching material. Then I made the mistake of loaning it to a buddy who forgot his patch knife at one shoot and he flat refused to give it back to me. Grin.
I tried attaching a small knife to the strap of one shooting bag, but it often got hung up on dense undergrowth when hunting. So I switched to making a scabbard for it and sewing the scabbard to the back of the hunting pouch. That worked a lot better, at least for me.
Gus