That looks great! Thanks for you suggestion
If someone is using Home Assistant, you can also use my integration now which is based on bluetti_mqtt: GitHub - Patrick762/hassio-bluetti-bt: Bluetti Integration for Home Assistant
I also asked Bluetti about more info on the bluetooth addresses they used but got no real answer.
The biggest problem right now is that I cannot add new Bluetti devices since I can’t buy them all. It would be great if there was a way to test the integration on devices that Bluetti provides.