Clever!
I've just tried something a bit similar, using low friction eyes on strops, existing bullseye fairleads and jamming cleats (to avoid drilling any more holes). The results were disappointing. I don't know whether I've got too much friction in the experimental BRe type system but I found it much easier to get the back of the jib boom off the deck with the existing jib outhaul, without the benefit of mechanical advantage.
Back to the drawing board.