Or not worry about it. The whole "OMG WIZARDS IN ARMOR" thing is kind of silly. Sure, being able to wear heavy armor is handy, but when you consider that you can do just as well stacking mage armor with bracers of defense and a 14 Dex, it's hardly game-breaking.Or just ban wizards casting in armor.
Ultimately, it's very, very hard to break the game with purely defensive attributes like AC. In this case, you can't even get your AC to unusual levels; all you can manage is to bring it up to where the fighter's already is.
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