In doing the same, I'm considering feeding the light for the back doors from the window switches. Both of my switches' lights are dead, and in replacing with an LED, it might do to get a feed from there to a second LED. Although I would have to devise a way of doing it without stopping the panel from being taken off, I would have to add a connector to that layout. Links I had found from Shogun gave me the idea.

The trouble so far will be to find a good connector I could use to plug and unplug the LED.

Otherwise I'm thinking of adding a pair of LEDs per front foot wells so far, and link those to the cabin lights.