I have now connected my Anywhere 2S with my iPad and it works without any problems. You only have to activate AssistiveTouch in the settings and connect the mouse under AssistiveTouch/Pointing Devices/Devices (this is not possible directly in the Bluetooth settings).

Hey, I'll have to give it a try. I have a mouse like this 😁 I actually think that if a mouse has bluetooth, the connection should work.