It works well enough for this model with it's small portions where it actually matters, but as a general solution, it's just dither hell. There's a reason why up to this day, hair is often rendered as either single line entities or more or less as a closed hairstyle with some transparent additions as single objects. To be honest, i would simply scratch the "hairy" details from this model and render it all opaque. It might not look as good as it does now, but i don't think that anybody will bother, especially not in motion.
