Hi, I don’t think there is a hardware solution for your use case, but there is a software solution that can work with any Z-wave or zigbee thermostats that are compatible with your setup.
P.S. You should look into the latest Sinope thermostat (zigbee) and/or the Stelpro Zwave thermostats. I’ve both at my place and they work very well. I’ve coded the DTH for the Sinope thermostat, so it works very well with Amazon Echo and Google Home if it’s important to you.