Did a similar flight a long time ago in an Islander out of Gold Coast heading East and the thought of being in their situation was definitely high on my mind, looks like they did an excellent job and came home alive. One thing I remember being told about that giant bladder sitting behind me was that I was fairly overweight and if the worst happened just turn on the pumps and let it start dumping overboard if needed to get that weight down, just a thought for anyone having to do a ferry in the future, think about how you can get rid of all that extra weight if the situation should arise so you can get as close to rescue as possible, every minute counts when you're out in middle of the cold ocean!