Steve,
I work in the marine insurance industry, and so far I have never even heard of a carrier denying coverage because of Dynex. It certainly could happen, but generally as long as the boat passes survey they don't really care. The bigger issue in insurance with rigging is that most rigging is used far beyond the service life recommended of the manufacturer, and this can lead to a denial of a claim, though it is still rare.
As far as furlers, you would need to contact Colligo or one of the other suppliers, but I think they still require wire underneath the foil, or there are some furlers that are self supporting. My guess is that here you would need to go with wire unless a manufacturer gave you the ok to use something else.
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