Take a pigtail of vectran or other aramid about the same length as your current wire--use the same diameter as your current wire, as well. Splice it to the core of your current poly rope (appears to be standard yacht braid). Suck the splice inside the cover and whip. If you want to, you can use the same thimble over the whipping, but I suspect it won't be needed. Took me a half hour, but I don't do many splices anymore, so I took my time. In 1985, this was probably the best, most reliable available. But the quality of modern materials is really good. Uv degradation of aramids is an issue, but just keep the pigtail in the shade when not in use and you will be good at least as long as current halyards.
If you wanted to, you could even make the entire thing of a 1/4 " high tech rope and just uncover the pigtail. But that's a bit more expensive...it would be appropriate for high end racers who want the least windage and weight aloft.
_________________ R/Thom SeaRail 19 Triak BMW C600 Formerly Getaway with Custom Spinnakers Formerly raced F24 Mk II
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