The ISC don't have Command variants so they will always be a problem in this type of classification system. Certain ISC CA variants could be considered Command level (CAY, CAT) and others BCH level (CAZ, CATZ) just by firepower alone. Anything CAP or below is just a regular ship for all intents and purposes.
The main problem with that old list is that the only ISC ship eligible for the Legendary Officer bonus is the I-NCA (which is just a CAZ lite at 191 BPV) and that comes out in 2288... three years after the server ends.
We need several lists of proper ships for each rule section that has restictions.