Quoka island ain't 30m wide from memory! Nor does it have the pavement to take a 73' !
Short, narrow, poor surface, hills at both ends - does have an rnav approach though. - but I'd imagine you'd cleanup the windsock and a couple of trees in a 73. Possibly a fire extinguisher in the terminal if your lucky.
Including a flight over water when low on fuel - wouldn't be my first choice.