Rather than monkey-rig up something with oversized soft wire and nicopresses, get a pro to expain and walk you through setting up a norseman fitting and use those. I find it bizzare that you are concerend about safety but are considering nicopresses. Plus, on a nice boat like a Norsea they will look awful, catch your pants every time you walk by, and detract from performance, resale value, and cause folks to question your sanity. If you are worried about cost, try to save money on labor (which you can do yourself) and not by using outdated and unsafe methods that are more suitable for telephone poles. I'd go to a good reliable rigshop and tell them you want to replace the gang yourself and that you want them to teach you how to install a norseman fitting. Then buy yourself some wire and some fittings and measure carefully and cut and seal and take your time and build yourself a new rig. If you have a furler on the headstay and are worried about norsemans untwisting, either get your headstay swaged or use the manufacturer's reccomendations. As an aside, I can say that we swaged most of the rigs that came through the shop for cost reasons, and this was on SF bay, where it blows like stink all the time, and I don't think we ever saw rig failures due to swage failure. Rigs usually fail because they have been neglected, a spreader fails, or the mast inverts; not because a swage fails. Ask your rigger, get the swaged measured to spec before you use it. But please - please - don't use nicopresses!