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How about an incrementer on each class, in order to handle level?
Since unlike AD&D v3+, class order doesn't actually matter in 1st and 2nd, only the level, there isn't a need for the ordered list of classes that Pathfinder and d20 use.
You wouldn't need the Class/Class level distinction that d20 and Pathfinder use, either - you'd just add a single Class pick to the table for each of the classes you wanted to use.
Although you'll need to think through the dual-classing rules. I remember that those were pretty illogical and hard to understand, so I don't know if they'll affect how you need to write the class mechanisms.
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