I don't know about condura (with a plastic liner and some sort of snaps, I am assuming), but what do you think about Kydex? With Kydex there is no need for snaps, you can can quickly remove and replace the knife without any fuss. Kydex is very tough, too.
The top three Kydex sheath makers are, IMO:
Bob Dozier
Eric at OnScene Tactical
Buy Brown
Okay, I must confess I have never used an OnScene Tactical sheath, but they are supposed to be very good. I had a Buy Brown sheath for a Busse Mean Street and it was really good. IMO (and many people agree with me), Bob Dozier's Kydex sheaths are the best sheaths in the world. Period. And yes, he does custom sheath orders (not just for his own knives).
This may not be the direction you want to go in, but it will at least give you something to look at and think about. Hope it helps.