2017 sport (just went out to the truck to investigate) .....
- RR settings button takes you from rear settings to drivers settings (back and forth, no wait time)
-the passenger can adjust the RR temperature
This is the part that you have to make a leap of faith with:
You set the temperature for the rear with the driver's-side temperature flip-up, flip-down switch. You can only do that when you're effectively in the rear seat climate mode, meaning that you've pressed the RR button. If I remember correctly, it's time that gets you out of that mode. So, so many seconds without activity, probably 15 seconds. Then the driver's-side temperature adjustment will apply to the driver again.
By the way, it's possible that the passenger-side temperature control works for this purpose too. I've just never tried that. It should do it if it doesn't.
