Choules was meant to be medium term replacement while LHD was being built after LPA's were parked on North Head
Tonga assist 2022 is a good example of the type of work JSS can provide If we pick the right ship.
At the moment HMAS Supply and Adelaide are deployed. With JSS, only 1 ship would need to be there on station with LHD (When working) able to be a ferry for resources or even next gen LCH. JSS would be command ship, provide Water to the community and racks for troops on ground cleaning up.
Pacific support ship would be better if rolled into 3 JSS. At any one time, JSS ship would be "Pacific ship" and allow for rotations where the ship would spend most of its time in the region operating out of Townsville for resupply and rotate with other JSS over a time period.
Crew experience and training would be regular, interactions with Pacific region would grow and if any situation evolved like Volcanos or Tsunamis, your ship is already force assigned.