I was suggesting covering plexiglass with rubylith (i.e. taping to the inside of clear plexiglass sheets.) But if you have the plexiglass version of rubylith then I guess that's even better.
One other suggestion: Acquire a cheap (like $5) spectroscope off amazon. The triangle-shaped version with the wavelength scale (it is surprisingly accurate). That way you can see the spectrum through the plexiglass itself and save yourself some time and effort over fog testing alone.
Btw love your signature line quote
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