@bonecycle Welcome to TreeBuzz. I did a test climb on cone picking when I first got into tree work to ascertain what I wanted to bid my time at. One thing I noticed was the trees were all pumping sap pretty well. Any gear and methods you select toward should probably handle sap well. And then still have plan B and C for dealing with sap.
An old hand on another forum that was in the forest service and spoke of cone picking has said that the more desirable cones are in the very top % of the tree. He spoke of tying off SRT at one foot diameter or so and then having slings for remote tie off every few feet of additional elevation as they went up to prime territory. And yes, he did refer to breaking out at times.