Hi, I cannot confirm if the Keen Home vents & hub work well with the Emerson Sensi or the Zen tstats.
All I can tell you is the following (based on my experience):
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Ecobee is the best tstat on the market especially for HA purposes as its rich APIs allow many use case scenarios (refer to My custom Ecobee device DTH);
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With my zoning smartapp called ScheduleTstatZones, you can use any ST connected thermostat including any protocol such as zwave, zigbee or wifi;
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Many of my contributors prefer the ST hub and my zoning smartapps to control their vents in conjunction with their master tstat as there are many more options/settings.
For more information about the zoning smartapps, please refer to the ST community forum thread:
Regards.