It is a bit difficult to imagine the exact effect you are looking for but
Have you checked to design glass with normals? I mean I would try with
something like

pigment{rgbf<1,1,1,.9>}
normal{granite 2 scale .001}
..
..
..
(the rest of finish and interior properties)


I dont know what would happen but seems that it would let light pass through
the windows in a diffuse way, isnt it?

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