A local supermarket I visit is built on the site of an old livestock Market. They have picutures taken of this market - I guess fro the 1950s or 60s - blown up really huge and hung on the walls. The blow ups are maybe 5 feet by 3 feet- and the originals were probably 35mm or medium format. The grain is huge - but sharp as broken glass and just as irregular. So I know what MakL means, I think. Really old fashioned gritty grain... but rather than wish for a film that will probably never be made - best to search for a way of getting what you want from what we have. I would have said ADOX films were the best starting point, but now they are on the way out :-(
Maybe a Chinese film steeped in hot print developer?