[eru]

Thanks for the write-up. As far as I can tell, what you are describing in your first three paragraphs is exactly what I was trying to describe? Block specific wavelengths. (EDIT: sorry, I was mixing things up. My comment that I was referring to is https://news.ycombinator.com/item?id=41066579 but yours wasn't in reply to it.)

I don't think wearing any goggles with screens in them is realistic for climbing at the moment.

Yes, adding more distinguishing factors to the climbing holds works. A laser pointer's dot can be seen as a very temporary distinguishing mark.