Rer-purposing the Defog and Fasten Seat Belts lights?

I don't use the rear defog grid and I always fasten my seat belts, so those two warning lamps aren't needed in my car.

In stead, I've already re-purposed the defog switch for the spot lamps, and I don't know what you could do with the seat belts lamp- any ideas?  Maybe something like an switched auxiliary 12V socket, a switched USB charging port, or a warning for the lock-up torque converter... A computer CPU-fan supercharger?  ?

And so, I'd like to re-label the blue defog lamp face to read "SPOT."  Can you get clear plastic faces, or would it be easy to make them?  then, you could use a label-maker with clear labels to put new wording on the lamps.  You may even want to change the bulbs to LEDs.