What boggles my mind a bit is that true colorblindness glasses don't seem that difficult to me. Standard red-blue 3d glasses almost do it, it's just you need red-green differentiating glasses. I don't think this would Open the World of Color!, but it would with a bit of practice probably allow you to at least perceive a difference.

But the glasses need to be visibly-differently (to a non-color-blind person) tinted. If they look the same, they're not going to work. Just like a "blue-reducing" pair of glasses needs to look visibly yellow, or it clearly (in all senses of the term) isn't doing anything.

A truly optimal pair would take some sciencing but bashing something prototype-quality with something like https://www.amazon.com/dp/B0928YT83C would be a matter of holding up the cyan-ist of the films up to one eye and the magenta-ist of the films to the other, and looking at some red and green things, concentrating on which eye the object is bright in.