Migrate deconz Conbee 2 to Sonoff


I use a Conbee 2 Stick with deconz (no ZHA).
Now I want to use a Sonoff Stick with Zigbee2MQTT.
What is the simplest way to migrate all my zigbee devices from Conbee 2 to the Zonoff Stick?
I read a lot but didn´t find a way for me.


I would also retrain all of my more than 100 devicest. But do they keep the name, e.g. for the automation, or do I have to redo everything? That would be a lot of work…