New to robotics. Need dead simple rotary servo and rotary knob remote/radio.

I'm trying to control an adjustment knob in another room. It's not a volume control on a stereo, but the aim is essentially the same as that application that I keep stumbling across on the web. This knob controls air flow on a machine at 24psi from 0 to 10L/min.

The Machine is not at my house so I have yet to determine the torque requirements or degrees of rotation required to span that scale. I realize those two things will determine the type of rotary actuator I select.

Problem is that I've spent five hours on Google, Google Image, Aliexpress, various hobby RC sites, Mouser.. Digikey... et al, etc... and cannot find anything so simple as a plain-jane rotary remote/radio that controls a rotary actuator (must be rf for multi room and multi floor use).

Things like this frustrate me. Seems like such a basic need would be as common as flat head screwdrivers, but I find kits and products that almost fit the bill or, more often, offer many more bells/whistles than my simple need for five times what I'd like to spend... which would be nice around 20 USD for both items. New, used, surplus, take-offs. I don't mind.

So I SIMPLY want to control a rotary dial on a machine from up to 60 ft or so with RF using a remote device that is as close to a one rotary knob (emulating the rotary knob it's commanding across the house) without added features as possible.

So the basics...

Rotary servo motor to control a dial that meters air. Assume for the time being that this know peak to peak is less than 270degrees.

A controller/radio with as close to an ideal one rotary input (no other distracting functions) that commands the remote dial with RF for use between rooms and between floors.

Off-the-shelf interface that requires a minimum of tuning, setup, firmware, etc, in order to use these two together such that the control knob can be indexed against the remote knob and maintain those settings over time. For instance, sitting a few feet away when the machine knob is remotely turned to deliver

Any advice at this point would be HUGELY appreciated.