It’s an old post but for someone like me looking for a simple solution below works. Install and use the mode/routine/program child handler.
https://community.smartthings.com/t/release-free-ecobee-suite-version-1-6-1/132248
BTW, I got the device in use error when trying to save. I had to remove two newly created ecobeeXXX devices from the device list first and then I can save and configure.