I actually did it with my mesmer. Got swarmed, died over and over again. But you guys can actually get past the courtyard by focusing on the two Veteran Acolytes in the middle (they really stands out in the crowd, so you can’t miss them). Don’t bother res the NPC or trying to thin the Risen line, just get those Acolytes down for good. After that all the Risen disappeared.
I also got one minor bug at the end, when I was talking with the three Orders representatives, a Veteran Risen Squire came out of nowhere and attacked, although I’ve checked and no Risen remains after the courtyard phase.