Their is a riggers coating used by one sheath maker that is like the rubber liquid tool grip gunk that comes in a can. I can't remember the web site but I'll find and post. My civilian kydex IWB sheath has this feature with the rubber O-ring found on most commercial dive knives. The same hole pattern is there for the 550 cord security that I so favored for my randall 14 when not in work mode.
I always prefered a HK P9 in 45ACP that I got from one of your troops that had an Ops Inc can made for it. I felt it was better than any knife in a knife fight .....luckly never had the need to find out about the knife fighting with the P9.
Stay safe !
Yep, I haven't had to stick anybody yet either.