Understood. However, I am running through the suggestions made in the websites geared towards informing visitors to Zamami. Particularly:
"Verify your airline company’s policies regarding typhoons, cancelled ferries, and suspended public transportation. Also verify the procedures and fees for both cancelling and changing your flight reservations."
https://zamamitouristinfo.wordpress.com/typhoons/

and keeping in mind this:
"If you do end up on Zamami during a ferry cancelation you can ask the ticket office to issue you a ferry cancelation voucher which can be used to help facilitate changing your airline reservation."
Ferries : Zamami English Guide

What I have learned is that JAL does have policies in place, Avios through BA does not and this puts me in a grey area which I now understand better and which I can make contingency plans for.