How much do you think the image-setter service would run? That might be the best option.

Another thing I've wondered about is the mathematical relationship between the gratings (2000, 2400, 2750) and how those relate to the primary color wavelengths. It might be painfully obvious, but I can't see it.

I think there's a lot of creative potential for this kind of "print". Imagine having a large image made in this way, and mounted as a window high in a room with vaulted ceilings, for instance. By moving about the room, the image would shift through a menagerie of colors and only at one specific location would the proper colors pop into being. I think that could be really fantastic.