The joystick and two 1/8" acrylic panels (amber filter layer and clear anti-glare layer) are strong enough that I can pull on the joystick to wiggle the unit out (but don't tell the thieves this). I use the four factory threaded studs to hold the two panels on with flat head screws.

The top flat black 1/8" layer is attached with a little double stick carpet tape. This avoids the need for screw holes.

It all comes apart quite easily. I'll try to post some pictures in the next few days.