This is some real selfishness on his part. He can cast his regular vote based on how he feels about the candidates. The electoral college vote is supposed to validate the will of the people, not serve as his protest mechanism. If he can't do what is required of him, he should step down.
And he shouldn't be hoping more people do this, either. No electors should be casting protest votes. They need to respect the people's votes. If the state says to vote according to the PV of their state/CD, then that is what they should do. If they can't, step down. That applies to electors for Trump as well.
Just another reason we need to abolish the EC. We can't have people like this hijacking the EC to drive their own agenda.
Actually when the drafters put together the Constitution, they specifically intended for the electors to vote freely and unbound in case some issue should arise. At one point the Convention considered having Congress elect the president, but they didn't want the President to be overly indebted to Congress. That led to the EC which functions as a temporary, shadow Congress to elect the Pres/VP. Protest votes by electors contrary to the statewide vote would be completely consistent with the intent.
