Awesome, thanks @skippy992 - exactly the info I was after.
My importer says that if they replace the Headunit with their typical CarPlay system, I'll loose this functionality, but I'll gain HD reverse camera, HD screen and HD roof monitor. Or they can install CarPlay software and keep the all the rest of the tech as-is. Need to decide if I'd actually use the side/front camera - I can see them being useful but parking isn't exactly as tight as it is in Japan here where I am in the UK!