Just found this now, couple of things:
- I have had "smart" features in my home for years. I primarily use z-wave switches and a Wink hub, and essentially I set my shabbos timers once and never touch them - save for when I add the days of the week for the yamim tovim.
- The Wink/Smarthings hubs are pretty good about being able to bridge technologies, but it's not always clear what exactly is and isn't supported
- Instead of using a ring doorbell, why not try this approach: Get 1) A digital, connected combination lock with a key backup and 2) a web cam on the front door. This way during the week you can view the door via the cam, and use an app to open or close the lock. On Shabbos you can shut the webcam off, and get into the house via the key.
- As for thermostats, I'd suggest looking at the ecobee4 (which I don't own). It's screen seems to be always on, and it has alexa built-in. One of the other features it has over nest is that it also has remote sensors which you can add to other rooms in the house to help balance out the temperature