My friend and I just took one 70 meter rope because we were told that a single 70 BARELY works on the final rappel of the Honeymoon chimney. However, I remembered hearing that a single 60 would get you down Excommunication. We ended up rapping Excommunication because it seemed like the rope was less likely to get stuck. Rappels were nice and the ledges were "cushy". There was some extra rope left over on each rappel which seems to confirm that a single 60 should get you down. That is what I would take if I were to do the climb again.
I'll add your rap. beta to the Honeymoon Ch. page. Which direction do you start the Excommunication rap's off of the summit? Would you start by dropping down the same line as the standard finish to HC (that little 5.8 dihedral right below summit)?
Your first rappel is close to the 5.8 finish on H.C. As you are climbing up the 5.8 finish, you'll notice some bolts about 15 feet to your left. Those are the final bolts to Excommunication. The anchor bolts are directly above those bolts on the Northwest corner of the Priest.
Start your rap from that anchor and follow the bolts down until you arrive on top of a large ledge ~25 feet from the summit. Once standing on the ledge, you will continue rapping down the North side of the tower. You should see more bolts directly below you.
From there, the rest of the rappel should be very obvious. Each rap anchor is located on a nice cushy ledge.
much thanks for the rap option info. I've added it to the HC page (finally).