Here's a harder question for you.
Say you switched the magic mouse off while logged in, then when you go to switch it back on you had the click squeezed while gripping the mouse to get to the tiny button.
Now what? Mouse un pairs, goes into discovery mode and won't reconnect even when u switch it off and back on. You have no other mouse only keyboard. I can get into settings with keyboard. I can navigate to Bluetooth devices by typing into search and using tab but how do I navigate to the little plus (+) to re pair my mouse?