@camilobotero I just sort of... asked, explained that I wanted to leave the corporate web because reasons and asked if they were up for trying a different instant messaging app.
You have to get a few key people to join, and then for each person you convince the rest are easier. I expected to get nowhere with it, but to my delight most people were up for it. I guess they are already in WhatsApp, messenger, and more so what's another client?
As for the difficulty of Matrix as a concept, it wasn't really a problem. Told them to download element, and that if they were unhappy with it there were other apps to choose from.