I don't know anything about scanning film, but perhaps a microscope scanner could be used to do that? 8000ppi is nothing for those, there you're looking at ~10 pixels per micron (see
https://cancer.digitalslidearchive.org/#!/CDSA/acc/TCGA-OR-A...
). If you can fix the film somehow to a pathology glass slide (75x26mm) you could load 100s in the machine and have it scanned overnight. It will be multiple GBs per slide though.
They do cost about 2x-20x as much but they are fairly ubiquitous in research hospitals or universities. Some (like Philips) also have annoying software so people are getting rid of them for cheap