Here's the idea: Holding down the super key for long enough will show this window, revealing all the shortcuts of the active window. In this case, the desktop is the active thing and holding down super shows shortcuts that the desktop uses.
what happens is I need to do something like this, for some students in my classes, who installed Elementary OS on their laptops and need explain graphically shortcuts because they are younger than 16 years old. So, I liked how it was what you did, but I have enough time to "build it myself", so, if you could lend me some svg like this, well if you want, no problem at all events
I realized that too but I must say I'm not that happy. alt+click is a clasic in all Linux distros, so I don't see the point in changing that. I can live with it but I'd like it more if it was alt+click.