We have a traditional thermostat in an awkward to reach place, so I’d like to replace it with something I can stick to the wall.

I’ve got a few shelly devices running already, so the Shelly TRV comes to mind, but that only takes care of the receiving end. Ideally I want some kind of simple rotating knob or slider, battery powered and connected to wifi.
I have home assistant set up so anything that works with it is fine, though nothing that requires a cloud connection. I’d very much like to keep it budget friendly, so avoid fancy displays or even touch screens etc. Just give me something I can physically grab to crank the heat.