Another Option?
Another Option?
I wonder where you could put the occupancy sensor with the open area above the stalls as you describe. I picture the sensor picking up movement from outside the stall.
I have used Lutron wireless switches in a residential application. If you could mount the receiver switch by the fixture, then you could mount the wireless switch by the stall. You would need to consider a dust tight installation. You would accomplish the same thing without all the wiring.
But you still have the battery thing and depending on someone to turn it off. Not exactly the worry free answer that you're looking for.