Yes, it seems your Westerdam cruise on 16 March from Auckland arrives in Sydney docking at the OPT, several others do not and actually go to White Bay.
As the Royal Princess is too large to get under the bridge, it too is docked at the OPT on 1 April, no joking intended.
I think at this stage it would likely only be Noumea affected on the itineraries, and it may all be over post election.
So possibly the Pacific Adventure and Splendour being affected.
The tripod would weigh more than an extra pair or two of knickers, but I agree washing along the way is easy, and housekeeping would see much worse than clean undies drying.
HAL have this type of arrangement, as do a few other lines. Sometimes it works and sometimes it doesn't. One issue we had on the last cruise was just a general lack of staff leading to longer dining times.