Somewhere out there is a source for the flush-mount slotted shaft pots as used on the blackstone appliances mosfet:
Depending on what you're building, you could mount all of your controls on the top and still have external access without either messing up the art or losing pedal board real estate.
I've looked a few times but never been able to find these kinds of pots. I think it's probably because I don't know the proper industry term for them? They're often used for bias adjust on amps.