What I would do...
Let me know what you think about this idea...I'd terminate one end of the jack-strap at the mainsheet u bolt in the cockpit, go forward to the mast, take one or two turns around the mast base, then continue forward and tie off to a cleat at the bow.I'd have two tethers so that one could be clipped before unclipping the other while getting around the mast. You wouldn't need to unclip unless you needed to go forward of the mast more than a couple feet. You could reef, etc. while clipped on aft of mast.The reason for rigging this way is that:+ I'd rather not be tied to the edge of the rail. Even if you start clipped to the windward side, it will become the leward side if the boat tacks or gybes on you.+ The mast will provide some additional support and effectively make shorter runs, reducing sag and stretch.Lead as many control lines back to cockpit as possible. On my H260, I've got a jib downhaul (no roller reefing) led back as well as both halyards. Do have to go to the mast to reef, but unless something hangs up, I don't need to go forward of the mast.Also, learn to heave to so that you can reef or do other work on a much more stable platform; and teach your crew as well so they can heave to to pull you back on board, if needed!Fair winds,Tom