[dquack]

Sounds like you have a cool boat. I'm not sure that the typical boat made today is actually better than the ones made many years ago. In fact I think the older designs have a lot of good features that have been lost in the name of weight savings and speed.
Anyway, I was talking to a girl here at the marina who singlehands her 1979 Hunter 30 all the time (very active sailor). Strangely enough she was asking me about Jacklines and tethers for her boat. She decided on a tether with three different lengths so she could work 1)on the rail, 2)at the mast, and 3) full length to reach over her dinghy located under her boom. I have a heavy duty sewing machine here and we are making it up specifically to fit her boat. She has a pad-eye at the Cabin Exit on the cockpit, At the Mast and two at the beam, along with her Jackline which runs from the front oh her cockpit to her toerail near the front of the cabin. She was walking all over the boat making sure she could reach everything by just hooking different hooks on her tether to different attachment points.
She loves the really short portion on the tether for working at the mast. She calls it her third hand and leans against it while working there.
We used 20,000 pound webbing for the harness, 6,000 lb tubular webbing for the tether with a bungee sewn in it to take up slack, and flat 9,000 spectra webbing for the jacklines (so it wouldn't roll underfoot).
I feel confident that the right tether, jackline, and pad-eye combination can be created to keep you aboard when working anywhere on the boat.
Even for leaning over to work on your boarding ladder.