Homebrew Question about injection banners - modifying colors.

[ToddBarker1]

I've been re-doing the bulk of my Game Boy family injections in celebration of my new N2DS XL and had the idea to randomly change the console color in the banners using NSUI. Original GBA and GBC available colors, respectively.

I'd like to add approximations of the various original GB colors (play it loud, etc.) but NSUI only allows for changing the color of the cartridge.

Is there a relatively easy way to accomplish this? Furthermore, is there a way to inject a GB game with a GBC console as the banner? For use with a color romhack of Super Mario Land 2, for example.

Thanks all, hope you're well!