Received a new Logitech mouse and keyboard from work recently, MX Keys. One of the first things I wanted to do was pair both to the same receiver.
Expecting the usual trial of passing a USB device to a windows VM to run some proprietary software, on a whim did a quick package search for Logitech. I found #Solaar, not even an AUR package, it's in the community repo.
https://pwr-solaar.github.io/Solaar/
Blown away by how good this bit of software is. If you're using #Logitech peripherals, check it out.