I might not understand the terminology right.... I have a lot of knives with kydex sheaths and removable parts. None of these are any good for discrete carry. All the sites say molle compatible, so I assumed they were knife exclusive parts. All the parts work with the other sheaths.
Mollie is the one inch webbing used on Military gear now updated from the web with ALICE clips of the 80-90s. It is quite common now and is now crossing over into hunting. It is a great thing for securing gear together and modifying loads to make it more mission specific i.e. adding more ammo pouches or putting on knives or first aid or hydration systems, but for concealment, you have to have a platform to MOLLIE it to. Concealment not so go for.