I'm really missing something here I guess.
If the stall goes really low, to where you can't see anything under it. It can stay in the holster. If it is about 1 foot of clearance from the ground..I know this sounds crazy. It's like fire and water. Also goes against my "within" arms reach of the gun at all times. But...
In the sink wrapped in paper until you're done to reholster. I know...crazy.. I for one, always wash my hands. So I'll know it's in there and won't forget it. 2 birds with one stone.
So I'm assuming that if the stall doesn't go all the way to the floor you're worried about someone seeing your gun hanging off your belt while you're sitting down. So instead you...
...leave it in the sink???