Rearview Mirror Backup Camera in 2015 Tacoma

So, I'm looking at doing an ipad dash in my truck. Going with a NavTV Steering wheel interface, iPad audio out hardwired(or WetSounds bluetooth controller if I cant find a bluetooth backup camera) to my Taco Tunes processor, and a Bad Elf GPS module.

My main concern is retaining my back camera. Ive found a couple option, there is a WIFI reverse camera kit where I'd modify the camera to replace the OEM one, but it would be a hassle to have to switch my WIFI back and forth from my phone to the camera on the iPad.

Another option is one of those kinda cheesy aftermarket cameras integrated into a mirror. But I'm not a fan of those clip on mirrors.

What Id really like to do it go the OEM route. Is there a way to integrate the stock backup camera that goes into the stock radio into an older mirror that has the backup camera screen in that? Or would I have to get an older backup camera system with the camera, wiring, and mirror?

Thanks!