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If they have not been bleached (which if they were B&W processed they should not have been), then there might still be colour the oxidized colour former waiting to mate with the colour couplers found in color fim developer
There is the question of how much of the dye formers created when you initially developed this as B&W are left years later if they were never stabilised, but my understanding of the theory is that you should be able to send them through the conventional C41 process to get color negatives. (apart from the fact they are all mechanically short strips now). There would be no silver halide to be developed by the colour developer, itself, but there are couplers present if it is a seasoned developer. Then bleach to remove the excess dye, and fix to remove silver halide recreated by the bleach, and wash and stabilise.
If you want to print them as is B&W, consider using something like 80CC blue to counter the cyan mask.