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Instead of messing around with anti-Chupa mechanics, it would be better to rework Chupa itself. Make it magical, using fighter art. For example, +50% to combat stats.
Or, implement mass spell suppression, so that both spells can only be cast up to the Advanced level. It doesn't matter much for a mage; resurrect and dispel are still powerful. But for a warrior without magic, it's quite difficult.
People have long wanted an analog of the blue cap for the Amulet of Renunciation, but for the 4th level. Of course, it should be moved to the Relics category.