Tom, you could sew a few strips of 1" nylon webbing across the front (spaced 1" apart) and stiched "vertically up the sheath" to make a hybrid leather/MOLLE capable sheath. Seemingly everything made today has MOLLE/PALS on it and nearly all pouches are now MOLLE/PALS compatible.
See my post above for how I attach MOLLE pouches to kydex.
This could be done on Kydex sheaths by attaching webbing to the sheath. I would attach webbing by hand-sewing webbing front and back or by hot-punching holes through the webbing and attaching with Chicago screws with appropriate washers.
This could be done by forming and attaching horizontal Kydex strips or with rubber or leather IWB loops
I could do it these other ways on Kydex, but the 550-cord (and shock-cord) is quick, easy, and sufficient for my uses.
