it’s called ‘uni’ as in universal. line-to-line, line-to-leader, line-to-lure, swivel, etc.
you’ve got daisy chain webbing straps, right? substitute the loop on that for the loop off the eye bolt in this vid. quick and easy. waaaaaaay better than the frickin’ hennesey knot. towards the end he also addresses hennesey’s spectra line and shows a modified two-turn version that looks secure. check it.
#4 i think is the bowline-around-something solution we’re looking for.
Good knot for heavier tackle, used with great success in Carolina Rigs.