So what to do about mnemonics? What about keyboard placement?
> This means when the key combination is alt+/, the shortcut should be triggered when a german layout user presses alt+shift+7.
Really? The / is conveniently accessible on a US layout; shift+7 isn't. So this gains you the benefit that you don't have to change documentation (it is "/" however you type it), but much less usable on other layouts.
Alternatively, you could try to use the key in the same physical position, but - is already used for other shortcuts due to its meaning.
> This means when the key combination is alt+/, the shortcut should be triggered when a german layout user presses alt+shift+7.
Really? The / is conveniently accessible on a US layout; shift+7 isn't. So this gains you the benefit that you don't have to change documentation (it is "/" however you type it), but much less usable on other layouts. Alternatively, you could try to use the key in the same physical position, but - is already used for other shortcuts due to its meaning.