Personally I wouldn't fly SE anywhere like that but each to their own. The older you get the smarter you get. Still having said that aviation is all about risks, calculated risks & as that saying goes..........chance favours the prepared mind.............
As 'XXX' said & some others I think said take plenty of $US green backs, a lot of the Pacific Is. are broke & bribery is rife.
Obviously you will be taking all the survival gear you can muster inc Sat Ph. You can call yr lawyers with one of these great devices & set up a live one on one arrangement for a new will whilst yr treading water with the sharks wondering whether to eat you raw or wait a while 'till you soften up..............oh no that's crocs like that I think:-)
Anyway great luck to you & yr friend, life without risk is not life at all
Wmk2:-)
p.s..............Norfolk Is is a "safe" place for a ditching I hear, high probability of survival & there's already a new aviation museum there you could add to if you needed to park yr new shinny plane off airport, trouble is it's hundreds of feet below the water!!!!!