You should be able to see what key codes the OS is receiving, but I don't remember how, will try to update this later with a link
Good idea! I found the command sudo showkey -k and found out which key codes are triggered by the FN+F-key combos. It seems the keycodes for FN+F4 and FN+F12 are already mapped by KDE. I think I'll be able to work with this, thanks!
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