Well I finished writing my integration of a GE Profile double oven where I can get state changes of the oven when timers run down, pre-heating etc. This approach uses a python bridge running on Linux, can be Proxmox, Pi, NAS, etc. The alarm on today's ovens are so quiet it's nice to have announcements over the speakers in my home with the oven is ready or the timers complete.
Look at the drivers I made as prototypes I wrote up the process for creating ones for your specific devices and some code to do the attribute extracts. Everything is in the readme.md file.
Nice work. Though I can't help thinking that if it requires a another machine such as a PI, wouldn't it just have been easier to install HA on that machine instead, and use the existing HA integration for SmartHQ and bring the exposed entities into Hubitat with HADB?
Apparently that integration gives you control of the appliances, and it exposes the status and countdown for timers that are set, that could be used for alert automations.
Yes a simple python scrip needs to run somewhere many folks already have a NAS or a Pi already running 24x7, even a Mac Mini or AppleTV can run this code. HA brings too many problems with it. I follow the HA board all the time and the stuff I see will turn you bald faster than Paul Hibbert can say Oh the Zigbee.
My goal was zero remote control of the Oven period. Only to get the status of timer, warm up completed etc. The attack surface of all this IoT crap is huge. Just think of the damage a hacker can do with connected devices like your thermostat cracking up the temperatures to 80s+, Oven turning on modes while you are sleeping, disarming your alarm system and unlocking you front door, etc. Operating mission critical devices should be left to their control plane.