I guess if you really didn't want to ever use the rear wiper, just pull the fuse or install a fuse bypass switch.A light drizzle might necessitate moderate usage of front wipers without any need to activate the rear. In fact, some people might never use the rear wiper and never bump into anything as a result. I'm not one of these people, but I find the rear wiper is not all that relevant to safe operation of the vehicle. It's more a novelty to me than anything else.
https://www.etrailer.com/Tow-Bar-Wiring/Blue-Ox/BX88272.html