Luckily, Mrs. FenwayFlier made the travel arrangements so no skin-saving will be necessary.

And yes, we'll be flying coach (not enough miles for anything else). Hopefully in the exit row at least!
Thanks for the Blenheim suggestion. Unfortunately, that was sold out too.
Regardless, thanks for everyone's opinions. Based on the feedback we've gotten, looks like we'll save the Cook Strait Ferry for next time. Thanks!