hotbars with aditional hotkeys

[DuKe2112]

I'd like to create a hotbar that looks like the numpad, so that the icons have the same layout as the shortcuts.

But to do that I would need 4 additional keys and I would have to position them manually.

Does anyone now, if and how that's possible?

Buttons would be a solution, but from what I understood, their funktion could only be changed in UIBuilder and not inGame?