Happy to do full gulf trip on my smaller game launch if want to pitch in for fuel… will even leave rods at home so you can focus on the sight seeing experience. Can hit waiheke, rakino and kawau in a day for you.
You can sleep overnight if you wish (delux airbed for two) on a blow up mattress under the stars. I will sleep up forward in cabin in my own bed. I may have to turn bilge on intermittently through night to clear a little water coming in through scuppers. But can reach switch without walking over you.
It would be your most economic option.
I too am appropriately qualified to offer this service (may have expired… but ask for only contribution to fuel, so legal) and have always been very customer/ passenger comfort focused.
Also have some nice sleeping bags for you to use at no charge.