Thank you, and yes you're right, Im weighing up just how much I want/need that overly large screen for all of the above reasons. We are really fortunate living in Brisbane Australia as the AC never gets switched off so leaking nice cold air is always a bonus but again you're right, not being able to direct it or change other functions whilst waiting for it to boot is going to be a real pain, honestly not sure how I feel about the practical side of this exercise but I sure do know how I felt about that big screen.Sorry I made those videos a couple years back and didn't keep them up long after I learned to live with the install. As for your canbus replacement, that will only solve the problem of your unit not recognizing the type of vehicle it's in. The problems /annoyances I mentioned are baked in the cake so you're not getting rid of them. For the air problem, I learned to turn the air flow to my feet before shutting down the unit. For the slowness, I installed cache cleaners from the play store and used the 30 plus seconds for my unit to finish initializing to adjust my mirrors or plug in my phone or something.
As for my carplay suggestion, I did buy one over the weekend and installed it on Sunday and it's working fantastic so far with the OEM Harman unit. The only thing I miss the Android (Tesla) unit for is watching Netflix and other shows which I probably shouldn't be doing anyway lol.