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Need to add a Smart thermostat to a 2 wire system

I currently have an EK2 with 3 two wire thermostats. I need to replace the main thermostat with a smart WIFI thermostat. Can I add a 24 volt transformer separate from the EK2 and run that to the new thermostat while using the existing 2 wires to communicate with the boiler? Thank you in advance.