In a very long thread about noisy smart TRVs, one person mentioned the idea of using a different way to control radiators... Wired devices not using noisy gears.

I've also been wondering about a less visually obtrusive setup for my period style radiators as the HR92 units are seemingly large and plastic.

The concept of a room thermostat and a radiator valve controlled from the central unit comes up, but I've no idea what other options than an HR92 exist. It does seem over the top to have multiple sensors in a room especially if there are multiple radiators, but thermostats are as expensive as HR92 units.

The website didn't seem to cover this idea, is it possible and if so, how?