Looking for a way to lock or display keybinds

[Blackwell]

I'm currently using a mix of xbox controller and roccat powergrid but I have teeny tiny problem, I always forget which keys are binded and I have to press random buttons and reassing them until I find out which one is free whenever I'm making a new button. Is there a way to either lock the already binded keys or even better display which keys are already taken on a keyboard layout? (I suppose that a generic piece of software for this kind of thing doesn't exist but one can hope)
This is the grid by the way, if anyone is interested I can drop the messy psd for the button as they grid itself is not complete.
[ external image ]

[Warsteiner]

Hi,

It's not with Roccat power grid, but with LEA Extended Input, it show the button that are allready used in red.
You are more free with the grid too.

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