Spell Icon Shading

[Colmbus]

Hi guys - I was wondering if anyone would be able to help me out with a personal project =) As you know when a spell is unavailable it is either shaded in grey or grey/blue. The latter usually denotes the ability requires more of a certain resource to operate.

I am hoping to create an add-on so all unusable abilities are shaded in grey as opposed to grey and grey/blue. Does anyone know whether this is possible? I am fairly new to add-on development so any assistance would be greatly appreciated!

Thanks for reading!