Hi, dark nemesis!
I have been thinking about the same idea concerning the AD. I think that would be good if someone wants to carry the AD upside down on his gear or backpack, easy to access. I would. I do so with my "almost-every-day-carry-infi", the PD.
But the knife would fall out of the sheath, when not strapped. Here's my solutuion: I fixed a piece of a thin mousepad inside the Kydex Inlet. That increses the pressure on the blade a bit. Now I can carry it upside down without even strapping it, with very fast access on the knife. It doesn't fall out, even when I jump.
Now fot the AD with it's small guard, there could be a kydex inlet that holds the blade tight, plus the strap for extra safety. I sure would like that.
greetings, arno