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But then limb walking to the center to drop down would be bad with that much extra friction, right?

That's cool, i didn't know those already existed...

I would try a rope wrench (really a rig and wrench setup) on the tie in point. That way when you are ascending it's effortless, but when you descend, you have friction. I'm not sure it would work, but it probably would with a pulley tie in. If that doesn't work, maybe the rings spliced in a row...