Clip-p-ping on

If you've not seen it before these guys have thought a lot about the best way to stay tethered to a boat including how to install jackstays (not qualified to critique it but they're persuasive):

Better Jacklines

Including on smaller boats:

Limiting COB Drag Risk On A Smaller Boat

It is a paid subscription to their site but they have a lot of stuff and is good value, I think
One of the discussions refers to "multiple tethers"

Staying Attached To The Boat

I havn't subscribed, so am not sure whar this means, but my initial impression, FWIW, is that this might refer to tethers permanently anchored to jacklines with a free end that one clips to, say both sides of the mast obstruction with a centrally run jackline

If so I havn't thought of doing this before and think it might be useful, though I'm not sure its better than having two tethers fixed on a harness.
 
One of the discussions refers to "multiple tethers"

Staying Attached To The Boat

I havn't subscribed, so am not sure whar this means, but my initial impression, FWIW, is that this might refer to tethers permanently anchored to jacklines with a free end that one clips to, say both sides of the mast obstruction with a centrally run jackline

If so I havn't thought of doing this before and think it might be useful, though I'm not sure its better than having two tethers fixed on a harness.
Yes, one of their recommendations is that the tethers stay attached to the boat not the person
 
Attaching to shroud does not give me the security I want, otherwise I would not consider an improvement.

You have been there and done it plenty - but not on my boat or with my disabilities
Try using two tethers to secure to different strong points and move one at a time. Or a single tether with two clips, one in the middle and one at the end.

Every problem has a solution.
 
I sailed on a gaff cutter once with no fixed jacklines, but with relatively short rope tethers on either side of the mast, and a slightly longer one on the Samson post for foredeck work. So you were on your own while moving around but secure while working. As the boat had quite deep bulwarks and substantial lifelines it felt ok, especially given the rather slow, steady motion of the boat; the one job that didn't feel safe was tying in the mainsail reef points.
 
Try using two tethers to secure to different strong points and move one at a time. Or a single tether with two clips, one in the middle and one at the end.

Every problem has a solution.
As an ageing rock climber who also does harnessed building works on rare occasion, I have and am familiar with multiclip tethers and multiple tether points- but thats not my issue. Its the part of the thread regarding the provision of clipping points/additional jack stays on small boats, that I was adding to.

Every problem indeed has a solution. If I darent go forward to the mast if above F4, one solution is to always have the main well reefed (as for F6 or even F7) before I leave harbour if any chance of F5 or more on passage (Our recent 24 hour crossings had F2 to F3 gusting F6), another is to give up sailing, but a third and more useful solution is to try and add safety features suited to my boat and its structure. This would be adding to its conventional toerail jackstay that demands long tethers that could hang you in the water if you ever went over the guardrail, with a jackstay routed very differently. The existing side jackstay would then mainly be the route to anchor winch and as that involves heading into wind, heeling and rolling are less violent.

Putting sail away from on top of the pilot house probable needs a clip point up there as well, or at least another grab rail
 
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