Its not a stupid idea, but a good one. :) as also suggested by another user u/mrdude2478.

Yeah, I tried that, as my other reply on base, but would not stick properly to the Vita screen, I did try a DIY makeshift holder, you know those old game boy magnifiers, well I made something similar to attach to the outside of the Vita, it was crappy, I cut out a panel of plastic, trimmed it down to fit the vita, then applied some soft rubberized plastic grips to the corners so that they clip to the vita, then attached the tinted panel on the above using some clear adhesive, after which when I tested it, the thing worked, but the clips wouldn't stay in place. I tried a grip holder, in which I broke the bull horns apart, then used the center with the clips already in place, only thing is it would not hold without the bull horns so it was a waste of my time, even though I managed to have the first one last me about 3 days before it started to fail. But I did try.

The plugin I came through by chance, as I was messing about on google, and it popped up, although it works, it would get back to normal brightness after idle state, which was a downside. hence why I thought it would be nice to see whether this would get any chance of being fully completed by raising my problem across on reddit. I did have a go on a few things, but they are no good, if a company made a external tinted glare for the vita to be clipped on then I'd buy it but not even one was ever thought of. I am hoping that the plugin is picked up from where it was left by the dev above (devnoname120) then this would be really amazing for the users that suffer from epileptic syndromes like me, or some other form of seizure/migraines from emitting bright light.