Follow-up: (see attached photos) I went back with a climbing friend, and we didn't see any straightforward way to install helpful hardware that would be cheap or easy (done in a single day) or handle different water levels (the water would be up to 6 feet higher in the rainy season). I estimate the crux move to be about 40 yards long, with a baby hole on the way and no catchable eddy at the end at most levels.
The photos might not show everything very well. River-right is not an option, either boating or walking. The cliff is not climbable without ropes for about 40 yards up, and in fact upstream you need to climb higher than that to do a rope-free traverse. I estimate the climbing/hiking time to be about an hour, without boats, more than 2 hours with boats.