My Mazda has the same controls and I’ve never really felt like they’re hard to find. The button layout makes a lot of sense and the large center wheel is easy to find so you can use it as a reference point to find the other buttons easily (I pretty much just use the home and music buttons and that volume knob).
One of the concerns I would have with custom ROMs for TVs is that I think a lot of the image processing magic that makes the image look good on these high end displays is done in some proprietary method that the custom ROM wouldn’t be able to use. Either in software or in hardware.
The magic of the high end TVs isn’t actually in the panel itself as much as in the driving of the panel.