The solution is to have a "mode selector" so that the buttons have a fixed meaning in that mode. Like a 3 position rotary selection switch, all the way the left could mean basic AC control.

I'd love buttons with braille on the surface so I could read what they said without looking at them. Does someone make mems braille screens?

*edit, looks like there is a bunch of stuff in the works

https://duckduckgo.com/?t=ffab&q=mems+braille+screen&iax=ima...