Confirmed, the Polaris setup won’t work unless the wiring is already there for an extra camera (via the touring pack installed from factory).
Back to the drawing board… need to find an Australian supplier of the Brazilian product posted by our good friend Renato.
I just noticed that this option is to add a camera to an Everest that already has touring pack, hence why there doesn’t appear to be additional modules etc. I’ll wait and see what their reply is.