However, there are 40-odd additional fields defined in ID3V2 (in addition to the 'V2 fields that duplicate the 'V1 fields) and I would be happy to sacrifice any of them.
There is a whole set set aside specifically for user-defined purposes. Any field that starts with X, IIRC, so that'd be 26^3 fields. I that that'd probably be enough.
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Bitt Faulk