That is an entirely appropriate option as well. I prefer a touch of humor, a heavy emphasis on the rule of law, especially the Constitution and the legal precedents on prayer at graduation and on prior restraint, and on the vast range of appropriate words that don't cross the line illegally ordered by this dictator in robes. If the entire class stood and recited the Lord's Prayer in response to the first word spoken from the podium, that would be nice too. There are so many options, but despite "the meek shall inherit the earth", this is not the time to comply with judicial overreach.
I don't think that "meek" in that usage means: roll-over-and-play-dead and let everyone push you around and trample the Constitution, wussies.