I have an E1 Roller Shade Drive connected to an external G5 Pro camera. The signal is pretty week but I do now have an M2 hub. How do I get the shade to use the M2, rather than the G5?
I have read, for Aqara sensors, that the only way is to unpair it and set it up again - will it be the same here?
Yes, the only way is to unpair and pair it with the hub you want.
If you have hub cluster enabled, and the primary/master hub connected to other ecosystems (like HomeKit or Matter), then I believe that the roller shade driver E1 will be automatically exposed.