Reach integration to camera and drone

Flying an M600 with a canon 5ds. I know I can integrate the reach module in RTK mode with the camera by using a hotshoe adapter either made or purchased. I’m really interested to see if I can integrate the same module into the A3 flight controller for another flight control. I want todo this instead of spending 4500$ on DJI’s RTK System! Any one know how todo this?

@Brian_Alsum DJI’s system is proprietary so it is impossible to connect Reach to the A3 flight controller without some serious hacking. E.g. A3 GPS module is connected using CAN, so there would be a UART2CAN converter required which replicates the DJI protocol.