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That's great to hear. Yes, both those crops were "canoe plants" that Polynesians took with them wherever they went.

Kava doesn't seed so has trouble growing in the wild unless conditions are perfect, in which case ancient stands of them might still be alive. In Hawaii, long after the missionaries tried to eradicate kava, some of the old cultivars were rediscovered in the 90's from old kava stands found growing deep in national park forests.

But yes if you did find kava growing there, it would be a rare cultivar and given its long shelf-life once dried and packaged, a great crop to commercialise on that island.