Ok some updates. Blick didn't sell that red glass at the store but they sold red glass paint made by Pebeo. I bought some thinking after I painted the glass it would be darkroom safe. Well no dice, the red #04 and red#05 failed the penny test, as well as a mixture of reds #04 & #05:

The paint was cheap $6 a bottle so it was worth a try.

I give up....gonna just use my 63mm lens on my enlarger and the under lens holder. Then I will have more room under there....

Thanks all for the brainstorms