android Is250 SE-L mark Levinson multi media nav system upgrade

[Tweefurs]

Ok so I have the stock mark Levinson nav multi pack system with 7 inch screen, rear camera and DVD player. I understand options for a stereo replacement  are limited as the controls like climate control are linked into the system.

There are some Chinese head units that have a 10.4 inch screen that apparently have control of all features built into the stock system and they apparently come with android 7.0?

The other option is to keep the stereo as it is and add something like Grom Vline which adds Android to the existing system, all apps from the play store are accessible albeit you'll be stuck with a touch screen from 2006. So no HD display. Mirrorcast is handy to have, but I basically want an android interface with access to play apps and not have to use my phone other than provide a wifi hotspot as I'll have unlimited tethering data. My question is..... what is the best way to do this without changing too much to the stock stereo?

Cheers.