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I think your only chance of getting this to work correctly without breaking the spellbook is to create a secure button which executes a macro to /click the spellbook forward/back buttons to the proper page, because calling any of the spellbook functions directly is going to taint everything it touches.
That being said, why not just make it so people can drag the spell off the button you're displaying, rather than open the spellbook? It seems like an extra step, unless I'm not understanding what your addon is meant to do.
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