I currently have Thinkware F770 with interior mounted rear cam in a sedan. I would like to install a new F770 in my hardtop convertible with an exterior mounted camera. Thinkware does not offer a waterproof rear exterior camera for the F770. Could I use a 3rd party licence plate backup camera if I spliced the wires to the standard F770 usb connector? I realize the video quality would not be as good. Is there any reason why the video feed would not be acceptable to the F770 for recording purposes? I understand I need a backup camera that does not reverse the image and has the ability to turn off the parking guidance lines.