Look into the Shelly home automation products, exactly what you need and VERY adaptable.
Home Automation
Home automation is the residential extension of building automation.
It is automation of the home, housework or household activity.
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I do this with the home assistant, honeywell zwave t6 and a zooz temperature sensor.
Multiple nest thermostats can do this, it just requires further setup but you would need to buy the pro models. Or, what Ive heard, zigbee thermostats do this, too.
I do this with Nest but it will show whatever remote unit is the current primary on the screen.
The reason I do it is because temperature varies in the house but I want the kid to be comfortable at night.
This should be achievable using Google home and setting an automation rule, e.g. with main thermostat set to 55, if Govee remote sensor (approx $20 US) in another room hits 60F, then set the main thermostat to 65F. When sensor hits 65F, set thermostat back to 55.
https://static.xtremeownage.com/blog/2021/fireplace-automation-part-3/
I do this. I control my fireplace based on another temp sensor.