I gave up on the G604… it’s just super flakey on the iMac. I’ve been using the Naga, plugged into the USB. There’s probably no reason I can’t use it BT. I just haven’t got around to it. The 12 keys are mapped to the SHIFT-Number row. Seems to work alright.
The G604 is now on the Surface, though I’ve hardly used it, as I don’t normally pack it in the bag. The Arc Mouse is in the bag all the time and gets used instead.
Even more… the Logitech M555 that I thought was dead, wasn’t. Even though I thought I was resetting the BT to use it, I must have been doing it wrong. Turns out it is paired with the iPad. So I will keep that set up.
My other mice… Well I have my old Magic Mouse. I’ve paired that with my work laptop (a boring, clunky, overly large Dell – doesn’t even have a touch screen). That leaves the Magic Mouse 2 sitting here next to the iMac…. in case of, I dunno, … something??