Another idea is to bring a 7 or 8 mil line on the RA and stash it near the spring somewhere. Then after Crest Jewel, rap the arches descent. People say it is so much longer than the NDG but I disagree and it is more straight forward. The only problem is that if you have to do it in the dark, perhaps it has a high epic potential (I would say that NDG is higher though in the dark).
I have done RA to CJ once and then RA to CJD and both times we rapped it. The second time, we were walking down from CJ with a party that knew the NDG and so we planned to wait for eachother in the parking lot of the Awahnee to see which way was faster. We were out about half an hour ahead and not really rushing. That being said, I had rapped the route at least 3 times before so I am somewhat familiar with it and it was light out.