I'm not sure if it's possible to access the character given the key code (the docs you linked implies it's not), but when we're interested in physical keys, I'd much rather use that nonetheless.

A good way to illustrate the controls could maybe be with an image? The keys on the image could say WASD for all I care, as long as I'm able to see the position of them, which is what matters.

There are similar issues for other things than games. Quite a few programs have `Ctrl + /` or similar as a keyboard shortcut, which is easy on an american keyboard, but on a Swedish one there's no dedicated key for slash (it's `Shift + 7`). The same goes for most symbols except A-Z (I use Swedish QWERTY), they are in other locations and with other modifiers.

Best, of course, is when you can get the character based on the physical key. One example of this is Visual Studio Code, where the shortcut for toggling the console is `Ctrl + Ö`, and presented as such. I assume they defined the shortcut by the physical key (the one to the right of `L` in this case) and presented it by its character.