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If you are only attempting to make the additional unarmed strike damage based upon Int instead of Str, then the Community Pack already has this option. It's a adjustment you would add to the character, where the attack and the ability are selected.
If you are attempting to modify the base dice damage based upon Int, then I'm not sure if Community Pack allows for that, but it might be worth a look.
If this is outside of what you're looking for, then my apologies for not being more helpful.
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