Now that several people are seriously looking at sensitizing dyes, in the words of an old New Yorker " It can't hoiht." I would like to be able to look at the spectrums of my emulsions. It comes down to the cost of such a spectrometer.
Someting that I have not tried, but your post brought to mind. Shooting color charts through cut off filters may be more informative than just shooting the color charts in sunlight.