Hi,
Interesting question. We have sucessfuly used Sta-Loks on galvanized rigging; it is a matter of having enough sealant to isolate the metals. If the wire is served, careful work getting the service tight against the terminals will also prevent reaction. The hard part will be forming the wire (I am assuming it is 7x7). Having the proper wedges will help, but it can still be a bear.
The Spectra notion would also work, and would be much cheaper. Short runs, too, so elasticity differences would not be enough to affect tuning. Just go massive, to keep creep out of the mix. And use Dynex's latest. Colligo or Precourt can provide terminals.
Any chance you might throw away that other backstay?
Fair leads,
Brion Toss
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