Even so, few people know that jury notification is an option (and promoting it is actively discouraged by the legal community), and it would be hard to convince

Even so, few people know that jury notification is an option (and promoting it is actively discouraged by the legal community), and it would be hard to convince a jury that he was justified because he wouldn't even be allowed to claim or present evidence that it was justified. He would just have to hope that his jury knew about nullification, and that they knew enough about the case beforehand to believe he was justified despite the prosecution presenting evidence that he willingly broke the law. Those are long odds.