CRT Shaders /overlays with non-native res - anything working?

So I’ve experience with some low-res lcds that always apply some scaling on their inputs and also recently found out that the old beamer I bought some time ago does the same. Is there any option so you can get somewhat even scanlines and not messed up masks? I suspect the answer in those cases is no, but what about integer downscaling via GPU from high resolutions like 4k to 1080p, is this different?

I don’t think there’s any good solution, unfortunately. I have run into this on Wii U and you just kinda have to find the ones that look the least-bad. Turning off masks goes a long way, along with reducing the intensity of scanline effects.