Sorry, but none of the proposals will achieved the desired result.
Changing IOR only change the way you see trough an object, but
doesn't (in Pov) affect the path of the light passing trough.

I know an example of "diffractive" raytracing :
http://math1.uibk.ac.at/%28de%29/~werner/light/spectrum/

But current Pov implementation doesn't allow that.

What I would suggest is : render your scene with 3 or more
lights, each having a color from the spectrum, and make them
slightly shifted from each other.
This would, at least, make interesting shadows...

Cheers,
Fabien.

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