In regards to the seasprite fleet, if we were just going to bolster the numbers with ex RAN sprites then why are we waiting as the problems are already known with this type, availability, support, maintanence etc, and the idle frames are just sitting in a warehouse somewhere ready to releive the pressure now.
If we were going with a new type such as 60Rs or 90s then agreed that will take time and evaluation but not sure if the problems are already identified now why we are waiting to sort at some point in the future, they are not going to magically go away and are still going to cost us the same money in the future as they are now(if not more).
If the sprites are as expensive to operate and maintain as stated due to its semi-rareness then why not take the hit now and upgrade to something new, with more roles and more mainstream which would create efficiencies in training, spares and operation. Logic would dictate MH-60 due to synergies with our closest neighbour and ally, but NFH90 also has some benefits ie less fleet types.
Something like 3 MH-60Rs(for the frigates) and 3 MH-60Ss(for support ships) would give us more tasks covered, a better supply chain and improved interaoperabilityand availability but also a smaller type would be required for the OPVs unless they can handle the larger helo type(s). I would say all Rs but the suites would probably be overkill and expensive just to sit on Canterbury or the new tanker for something like disaster releif and not really role specific.
Just a thought anyway unless govt are going to do the usual and give the current sprites a new paint job for a few more years life and run the platforms into the ground prior to handing over to the local museums.