I remember some keyboards in 90s to early 00s - back when tall keycaps were the norm - having secondary labels written on the side of the key facing the user, usually indicating the standard Windows shortcut for that key. The exact set would vary, but pretty much all of them labelled X/C/V as Cut/Copy/Paste. Here's a good example:

https://www.reddit.com/r/keyboards/comments/w72hiw/ive_been_...

It was certainly convenient for people learning the ropes. Too bad it died out when chiclet keyboards became the norm.