Follow-up.
I am really liking the Zen/Swann thermostat. The thermostat controller app is working perfectly. I also learned a little bit more about thermostat hysterisis.
Controlling the thermostat in the livingroom with a simple Sonoff temperature/humidity sensor at the bedside was easy and accomplishes what I set out to do.
Thanks again for the suggestions!
It's pretty darn nice when a plan comes together. 
They are pretty great! I dont use the TC app tho as I control everything via RM.
+1
So I've had my pair of Zen's for about 7 months now - my only gripe is they dont seem to like Alkaline batteries. they work great for a few weeks (even on Duracell Ultra's or Energizer Max's) and then they seem to struggle to take set-point changes via Zigbee consistently.
I've switched to using Energizer Ultimate Lithium batteries, (boy those are expensive @ $16 AUD for a pack of 4!), and that seems to improve reliability greatly.
it's interesting many device manuals instruct to use alkaline batteries only. My GoControl thermostat (zwave, not zigbee), smart lock, water sensors, smoke sensors, all have the same instructions. I use only lithium batteries now, last longer and never leak. The extra cost is justified for that. Why wouldn't they allow lithium officially as a replacement for alkaline is not clear to me.
I would assume it may have something to do with the discharging metering of lithium's, for example if I use lithium in my locks they always read 100% battery level for months on end, until they don't. The moment I notice they changed to 99% or 98% they are completely dead by the next day. Alkalines seem to more closely resemble natural battery drain.
I see. I noticed similar problem with some of my sensors, but I thought it was the issue with the sensors reporting, not the battery type. Not meaning to get this thread of topic, so should probably branch this discussion into a separate thread, if there isn't one already.
Yeah that is typical for lithium batteries, they usually provide consistent voltage till about 95% discharge. Then they drop off rapidly.
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