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The DCT of wavelengths that create the non-spectral colour.

No clue how you'd film in this format but the CGI and video games would be epic.

That's the easy part, just use a color space with imaginary primaries (see e.g. ProPhoto RGB), or use one with real primaries that allows for negative values – e.g. Windows uses floating point scRGB for HDR, which is just linear BT.709/sRGB, but negative RGB values can be used to cover the full range of real and imaginary colors.

But that's still mixing just a few primary wavelengths.

Just save pixel values as wavelength rather than RGB?

Maybe wavelets will make a comeback