I always wondered if I could do that, it doesn't seem hugely complex. Maybe they could sell me the switch and I could figure the rest out myself.
The switch is common. I broke mine and the local auto parts store had it. ISTR someone installing their own switch in a pre-1967 transmission - maybe search the forums.
Backup lights are a great safety feature; not just for night driving. Last week, I was in a parking lot getting ready to back up when I saw the backup lights on the car behind me come on. I waited for the guy to leave.
