Dither stabilisation
I replied on the original thread too, but I wonder if it’d work to use a mipmapped dither texture in texture space like this old hatching paper: <a href="http://citeseerx.ist.psu.edu/viewdoc/download?doi=10.1.1.28.8017&rep=rep1&type=pdf" rel="nofollow">http://citeseerx.ist.psu.edu/viewdoc/download?doi=10.1.1.28....</a>
It probably won’t give you exact 1 pixel dither without some hacks, but maybe something along those lines could work.