Please help: thermostat choice

[mike7]

I know, such questions were asked and answered many times, but may be someone can share experience.

I'm using eQ-3 solution in all rooms of my country cottage, there is OpenTherm thermostat connected through OT gateway in the coldest room (radiators valves are open all time). Unfortunately thermostat doesn't support room temperature override, so I should to get a new one.
I have an idea to setup thermostat with with external room temperature sensor, and I want to use several sensors for an ability to "move" the control room in my house.
This will allow me to reheat only certain room, simple - "move" thermostat to the room, open valves and set temperatures in OpenTherm & eQ-3 systems

So I need thermostat which will support:
- room setpoint override
- simple (thermistor) external sensor which can be switchable with relay
- support msgids 10 & 11 to work with TSPs

Please help me to make a right choice.

PS. Boiler is BAXI Luna 3 Comfort with outside temperature sensor