Hi, I was actually able to easily flash the device to Tasmota and I flashed it to the latest firmware. Thanks to all the information in this post and these ones:
I was able to get mine working and was able to easily set up the system to report the PIR in Home assist.
Below is my setup:
Template, Model Config, Other Config
Tasmota Commands I executed:
Enable Battery Mode: TuyaMCU 51,21
Enable TuyaReceived: SetOption66 1
Rule (1) to enable report the Reed switch trigger and release:
Rule1 ON TuyaReceived#Data=55AA0005000A65010001016601000100DE DO publish KitchenPir/tele/PirSensor Sensor_triggered ENDON ON TuyaReceived#Data=55AA0005000A65010001006601000100DD DO publish KitchenPir/tele/PirSensor Sensor_Triggered_Cleared ENDON
Enable the Rule: Rule1 1
Rule (2) to enable reporting the tamper switch:
Rule2 ON TuyaReceived#Data=55AA0005000F6501000100660100010068010001014D DO publish KitchenPir/tele/PirSensor Tamper_Triggered ENDON
Enable the Rule: Rule2 1
Hope this helps someone.