If you have a keyboard running qmk or something you may be able to just write a macro for that. I’m not super familiar with it though

This looks promising https://www.baeldung.com/linux/mouse-events-input-event-interface

You’d have to write some service that runs in the background monitoring for the hotkey that starts the macro.

I’d probably do it in python or another real language other than bash at that point

Haven’t used it in years but yes it’s the open source option.
If they really need Office they can use the web version on Linux.