Sure, feel free.
The thing about that though, is that right now it Just Works as long as you're putting it on the intended character. But if you start working with the unused colours, it means anyone using it will probably need to start mucking with the palette as well. So basically, it'd make the animation more "seriously usable", but also harder to just casually slap on for giggles, which frankly is the only real purpose for something like this.
Edit: Anyway, while we're on the subject, let me share Buff Healer-san's origin story.
Someone mentioned buff war monk Moulder, and then I made a quick edit of his standing pose and threw Mario items at it. ...That's the whole thing, really.