This is definitely in my interest and long plan. 
I love black and white grainy images!
I did already explore a bit in the past black and white sim of grain (some very old example with simple models of grain Embrace the noise! - #20 by arctic + a few posts in the later year/s). The current grain model is more complex and multilayered, with proper density curves. Also the addition of the printing step should add better rolloff of grain.
I am very curios to experiment with multi-grade paper and push-pull development, since there are a lot of curves for this. It is super exciting stuff! I need some time for that of course. I just have also a full time job 
, but I would love to spend so much more time on working on these models.