No man seriously I think it can be done with LEDs and a circuit board. Since I'm looking at the 94+ tail lights I bought, it seems those red reflectors can actually be popped out. If you could make a circuit board with like 50 or maybe 100 tiny white LEDs that could fit in a clear lens of that size it could be possible to make it fit without having to do any major cutting of the tail light lens.
I would be willing to try to make a mock one during spring break since I won't be doing anything else if people seem interested enough on doing something like it themselves.
Pic below show the clips that hold the red reflector in the 94 tail lights.
