I like the idea of having them in a switch as well. I want to do LED Reverse Bulbs in my stock housings to see how much it improves, but also with the LED style tails (those seem to have a clearer reverse lens). I also want to integrate an LED light bar for Stop/Turn/Running/Reverse between the tailgate and bumper to see if it helps. Finding the right one is tricky though, as I have seen some that are very bright, some very dim, and some that appear “pink” when in reverse.
That being said, if you do want to wire them up with the reverse circuit, ChrisFix did this on his Mazda Pickup with some LED cubes as well. He shows the proper way to wire them up as well:
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