By rule, unarmed strike does not qualify for Improved Natural Weapon. That said, if your DM is cool with it, and you want it to work, create a new .user file in the editor and go to the *Extend Thing sub-tab in "General" and add the following:
Thing unique Id: wUnarmed
Group Id: component
Tag Id: BaseNatWep
Save, recompile and voila.
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