I do. I have offered these options for quite some time. My knives also have the ability to be sewn into article so clothing. Great sewn in to the side of a boot. Or a heavy jacket. I also have the hard clip for invert carry. Not to be confused with the flimsy clips made of Kydex. Kydex an awesome sheath material, just to flimsy to make a good clip. (my opinion)Most neck knives are perfect in size for horizontal belt carry. Smart knifemakers should make the sheath usable both ways.
Or even include a removable clip.