As this is an interesting topic to me, I will check the possibility for you once I get my DS9 back from the paint job. They use the same systems; however, I have to check if there is a separate module responsible for the dual climate control.
By the way, here is a photo from inside. There is two cabels for USB and another one which looks like it is for the arm rest opening mechanism, but i have found no other cable which is prepared but not connected.
It’s not that simple. Replacing the panel isn’t enough. You’ll need a different air mixer and an additional fan for the third zone. Only then can you separately control the temperature and airflow in the rear. The wiring harness also requires replacement. I’ll skip the IVI and BSI changes, as they’re obvious.
Fan for rear zone in the armrest looks like