I directed a production in a school in NC in 2002 and at that time, in the materials sent by the licensors the Morgan Le Fay material was there.
(Confession: I was naughty. I dropped it and used the brief dialogue between Arthur and Mordred in the forest which came (I think) from the Harris revival. It was a better psychological approach to the drama, that short scene. I will now go into hiding so they can't find me and sue.)