*** No longer supported *** [RELEASE] Resilient My Ecobee Devices and ecosystem V6- migrated to custom capabilities & automation (presence, comfort settings, and more)!

I found a way to do it using the ‘eco’ mode.

The new version of ecobeeSetZoneWithSchedule & ScheduleTstatZones (v8.1.4) can now send the ‘eco’ command to thermostats which support this command when outside the zones or when the room with the slave thermostat is not occupied.

Just use the sellfy download link to get the new version.