Even a single pixel in the IR range is pretty cool, but something inside me wants the RGB pixel color in visible light range. Is that a case of un redshifting

Even a single pixel in the IR range is pretty cool, but something inside me wants the RGB pixel color in visible light range. Is that a case of un redshifting this pixel, or needing the optical inferometer you mentioned with multiple single frequency filters. Or something new? like a LHC style accelerator, or space based rail gun, to fire off a continuous stream of tiny cube sats towards the target, and using the stream itself as a comms channel back. Yeah I know, this planet is burning, and all that effort for a RGB wallpaper seems crazy, but 'space stuff' also brings knowledge and hope.