OK, so I have put this info together to hopefully show why I don't think there is a plug & play solution;
It is very likely that I am wrong and the units out there are capable, it's just I haven't seen any evidence.
Just to be clear, I am talking about the RD5 head unit here, this is important and I will hopefully explain why.
Pic1 is of my car showing the RD5, analogue clock, & LCD display. What is important here (big red letters)
is the menu button on the head unit. This is the only way to get access to the cars computer/settings etc. (AFAIK)
Pic2 shows what you can view/change within that.
I know a lot of these are going to be replaced with the new unit (audio functions, bluetooth etc.)
What you lose though if you cannot access this menu is; vehicle diagnostics, define vehicle parameters,
setting time and date etc.
All I need to know is whether the Android Double Din head units (or any other unit to be honest)
keeps this functionality or allows you to access these settings another way.
What I am tempted to do is drive over to the supplier and ask if I can test the installation myself by
fitting the unit and seeing what is affected. Not sure if he would be happy to do that though!