I have several pieces of leather glued onto strips about that size laying around different places. They are mostly what I use to keep them sharp. The 1000 grit diamond stone is usually sufficient as well. I like the idea of the 1000 grit on leather.
I use a leather belt with white compound to finish off the Zippers. It takes the wire edge off.
I have seen a lot, but never considered diamonds grit.
I once had a tool box full of strops, stones, and diamond plates that I used to teach scouts how to sharpen their knives. I have used all sorts of gadgets too, until I learned how simple it was. Most of them were garbage or useless.
That is why I know sharpening isn’t that hard with a bit of education and instruction, because nearly every boy 13 or older could get a razor edge. Many of their junk Chinese knives wouldn’t hold one long... And, I had a file or a small sander to go to town to create a workable initial bevel.