Hey Steve,
Thanks for all the investigating. I know you have hiked the route between Liberty Cap and Mount Broderick, but have you tried the route between Mt. Broderick and Grizzly Peak? Shown at: https://picasaweb.google.com/103089501068510688008/DivingBoard#5985497115361369810

Based on your own experience, would you go between Broderick and Liberty, or just go around Liberty? Any opinion as the the Grizzly Peak/Broderick route?

The e-ledges do not bother me and I've been up Half dome several times (however not with cables "down", although I doubt that would make a difference. In fact, it would likely be preferable due to less congestion and no permit needed. So, I doubt the exposure would be an issue. I did have my right shoulder replaced in 2013, so I am a bit more cautious (protecting that joint), but the route would not seem to test arms and shoulders.