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Location: British Columbia
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Re: Wire halyard through random block.
While I have found wire halyards far superior for main and jib halyards , for a spinaker they are less justified, as a bit of stretch there is not a big problem. They would eliminate chafe tho. You would want the biggest diameter sheave you can use, and galvanized 7x19 wire to minimize metal fatigue and broken strands.Tuffnol or metal would last far longer for a wire halyard sheaves .
Brent Swain, Boat designer, Builder, and author of "Origami Metal Boatbuilding"