I would snip off a bit, develop it in your favourite B&W developer. Take a guess as to development time, say 5 minutes. See if you get anything. Snip off another piece modifying your development time to get more or less exposure. When you think you've got the best you can, develop the whole thing.
I did that with some 30 year old Kodacolor X found in an old TLR. It's amazing that the latent image survived that long. I could almost read the year on the licence plate of this 50's car in one of the pictures. The person that owned the camera, or at least the daughter of the person that owned thecamera recognized some people as her OLD aunt and uncle.
I think that's all that rockymountainfilm does since you only get B&W from colour film.
Now how to split the film in 8mm and find a projector....