Make specific key sticky

I have found https://superuser.com/questions/410657/enabling-sticky-keys-under-xorg-awesome-desktop-manager that showed me that I can enable sticky keys via

xkbset sticky -twokey

This works as expected, but in my case I’d prefer to only make a specific key (Alt Gr) be sticky instead of all modifier keys. Can this be configured? And if so: Where?

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Author: Raven