Chuck - I want to be sure I'm understanding what you're suggesting since there isn't current IFTTT support in OR. OR will push to the Google calendar, via iCal, and all the IFTTT applets will trigger off the Google cal not something in OR?
I use Ecobee instead of Nest but honestly, this feature of Nest (which a family member uses at their personal residence) is one big plus to Nest over Ecobee. That said, it works in conjunction with their Nest app on their phone and their Vivint home alarm to determine occupancy, so I'm not sure how it would work in a VR setting.
Resurrecting the topic. I do have a set up where it sends and email/test top us to remind us to change thermostat setting before/after arrival/departure. but that is rather involved. Anyone had figured out IFTTT or any other way with Honeywells?
I use a system called Inthrma (https://www.inthrma.com/). It is great and the developer is great to work with.