Before this “dreamastered” version of the grindhouse, Dreamaster did a wonderful single pass colour regrade which I believe kept the grain and dirt largely (or entirely?) intact:
http://originaltrilogy.com/topic/Single-Pass-Regrade-of-Grindhouse-ESB/id/52161
Being done in a single pass, the colours on this aren’t quite as good as in the more recent dreamastered version, but they’re a significant improvement on the original grindhouse nevertheless.
Bluto