Today I have managed to install a 12.3" inch Idrive screen from a G30 LCI on a G12 car with Idrive 6. The screen is absoulutley huge in person. It is not plug&play, coding and some small modifications are possible as well there are some setbacks. This is not a permenant just wanted to test it out if it will work.
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As you can see the Nav Screen is correctley shown over the full screen and that includes Carplay. TV works over the entire screen as well as everything else.
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The screen is just huge and looks much bigger in person, maybe a little too big if you ask me. Big difference between this and oem size.