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If you copy the AC Bonus class special of the monk, and look at it's eval scripts, you can see when it calculates it's bonus, what field that bonus is stored in, and when that field is used to apply its effects. With that information, you should be able to intervene between those two points to zero out the effects of the class ability.
Then you can calculate a new value based on Charisma in a different script, and apply that as an untyped bonus to AC.
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