Am I correct that you have an existing device that works with SmartThings?
If so, do you have access to the driver code? It may be possible to port it.
There is no "inability for HE to handle wi-fi" a wi-fi node is just another network node on your LAN and is reachable from your Hubitat hub (assuming your network is properly configured). The "problem" with wi-fi devices is many (most?) of them don't have open api's. If you have an IP device with an open api, it should be possible to write a driver for it.
[I didn't see the second thread when I posted but there may still be some value in my comment so I think I will leave it.]
What I have currently, is Tuya LCD thermometers. They are tied through the Smart Life app and then the smart life hands everything over to ST. They weren't that expensive or anything, about 20 bucks a piece. But, I could plug them into a USB port for power and they did have an LCD screen. I could also send a refresh or a pain command and get them to update the temperature at will. Which is what I needed.
The only.issue i ever had was that it slip over to C from time to time. So i built a quick converter routine.
WiFi Room Thermometer Hygrometer Sensor, Temperature Humidity Monitor with Smart Alert 2 Years Free Data Storage Large Back-Light Screen, Compatible with Alexa/Google for Baby Home Garage Greenhouse https://a.co/iV8FMfg
There's already a device driver for integrating Tuya devices. The developer is pretty responsive, so if it doesn't pick up your thermostat, just drop a note in the thread.
Yes, and he has already been in touch. I've taken a look at it and even started the developer program to get the api.
My nature is to look at all possible solutions and then pick the best from the bunch. His solution leaves me in that hardware, perhaps there is new hardware that I'm unaware of.