Erps- so if I understand it correctly you would have a line, or you could use webbing, with a loop spliced into each end permanently looped around the the jackline. When you want to hook in just grab the other end loop and hook into the quick release. Seems pretty simple, you would have to have as many as necessary for the amount of crew you anticipate on each jackline or attachment place. You would probably want some kind of chafe guard on the one at the deck to prevent abrasion. Seems like it would work to me, and it eliminates one piece of hardware.
SV Laurie Anne
1988 Brewer 40 Pilothouse