While waiting for delivery of a new SimpleBGC board (any day now...please god any day now!!) I have installed one of these:

Never used one before but the ability to switch between FPV camera and GoPro has always interested me. Installation was quick and simple, I decided to patch in the output from the OSD so the FPV view includes the OSD leaving the GoPro view clear.

I toyed with the idea of adding a third, downward facing camera for landing, but decided not to bother as it would only be needed in an emergency and the GoPro can be tilted to point straight down.

My only concern is the video-out cable from the GoPro may add a little resistance to the gimbal but I'll just have to wait to find out!