This is one of the tail light covers off my M1025A2, which has one all incandescent bulb assy and one hybrid incandescent brake/turn and LED BO Marker/Brake. Now one of these I repaired before had a metal rectangular frame that held the BO marker lens assembly in place, this one has a clear, cup-shaped insert outer most with a 0.25" thick back plate with the Y shaped BO marker light that is pressed in and melted in place behind the clear cup. Now you can probably take a flat tip screwdriver to pop out the Y shaped BO marker insert but that may leave the clear cup prone to being pressed in or leak water. So I think its possible to punch a starter point about 0.25" from the outer edge on each corner, drill the 4 corners with a 3/16-1/4" drill bit then use a Dremel cutoff disc to remove the plastic between the 4 holes to allow the maximum light through the clear plastic cup. I'm going to see just how much white light the BO marker LED and bulb make after dark. Hopefully it should be enough to alert other drivers and pedestrians that you are backing out, worse case use a higher wattage bulb for more light. I didn't want to drill out the BO inserts on these covers because they are original to the truck, I'll find an extra set of covers maybe new manufacture to test the alteration for a build in Reverse/Backup light capability.
Some of the aftermarket backup cameras have IR LEDs to enhance the camera's night vision to make obstacles more visible, so hopefully the above alteration produces enough light to warn other drivers at a minimum and may help improve the backup camera's night vision, too. If it works that would simplify making the trucks safe for road use.
Edit: I checked the BO tail lights in darkness, it puts out enough white light to be noticeable, I wonder if using a Y connector to use both the BO marker and BO brake lights as Reverse/Backup lights would be better?