I figured as much.
Installing another switch will be a last resort. I went that rout on my Mustang and I feel like a pilot waiting to be cleared by the tower every time I drive it. I am trying to go the minimalist rout on this car
I think I would just cut the dimmer input to the stereo and manually dim it when I need to before installing a switch. The stereo (Alpine) allows me to manually dim the display but I can not manually override the dimmer.