a video came up on my youtube just now from a guy that has made a haptic, multi functional knob - completely custom build with instructions on how to do it:
He’s made a fantastic button that is much like the nest thermostat, but it can control anything.
The only caveat is that he’s barely touched the firmware and is looking for help developing it, from pricing the individual parts, 1 knob would cost circa £60, but as you can see in the demo, it has a wide range of uses (push on/off, turn on/off, level with/without min/max.
We could use this for anything too - just need that integration. check out his github: GitHub - scottbez1/smartknob: Haptic input knob with software-defined endstops and virtual detents
hopefully someone will help him make it, he doesn’t even care if someone makes it into a product. all open source.