It could be argued that with Choules providing vehicle decks, troop accommodation and a dock, the thing that is missing is a spare flight deck.
A small carrier can be designed to double as an LPH during the unavailability of one of the LHDs and without the dock and vehicle decks could actually be smaller, cheaper and have a smaller crew than a third LHD. Cavour Hyuga and Izumo are all designed and carriers / helicopter carriers with a secondary amphibious / disaster relief function with troop and vehicle accommodation designed in. Another option could be to go for something along the lines of HMS Ocean a proper LPH.
Either way whatever is selected could also be specified to be able to operate the F-35B, have the appropriate on board facilities and deck coatings workshops, magazines, etc. this ship could be designed to permanently embark a squadron of F-35Bs in support of the LHDs. When this ship is unavailable either of the LHDs could be used by the F-35 crews to maintain currencies and certifications.
Take it a step further, if the basic ship is cheap enough, we could actually look at two or three instead of just one and buy them as multi role replacements for the FFGs. Their helicopters and accommodations would support the amphibious and disaster relief missions while embarked helos could cover ASW, MCM, AEW and the F-35B air defence, anti surface vessel and land attack. Any task group would likely already have a DDG (AWD) and a couple of ASMD ANZACs escorting the LHD so the small carrier would be well enough defended with its afore mentioned capabilities actually adding to task force defence as well as providing additional strike / CAS support for the troops when they go ashore.
There could be a single large squadron of F-35B providing a flight to two of the carriers or three small squadrons doing the same with the other carrier either serving in the LPH role, covering off for one of the LHDs, or in refit itself.
A small carrier can be designed to double as an LPH during the unavailability of one of the LHDs and without the dock and vehicle decks could actually be smaller, cheaper and have a smaller crew than a third LHD. Cavour Hyuga and Izumo are all designed and carriers / helicopter carriers with a secondary amphibious / disaster relief function with troop and vehicle accommodation designed in. Another option could be to go for something along the lines of HMS Ocean a proper LPH.
Either way whatever is selected could also be specified to be able to operate the F-35B, have the appropriate on board facilities and deck coatings workshops, magazines, etc. this ship could be designed to permanently embark a squadron of F-35Bs in support of the LHDs. When this ship is unavailable either of the LHDs could be used by the F-35 crews to maintain currencies and certifications.
Take it a step further, if the basic ship is cheap enough, we could actually look at two or three instead of just one and buy them as multi role replacements for the FFGs. Their helicopters and accommodations would support the amphibious and disaster relief missions while embarked helos could cover ASW, MCM, AEW and the F-35B air defence, anti surface vessel and land attack. Any task group would likely already have a DDG (AWD) and a couple of ASMD ANZACs escorting the LHD so the small carrier would be well enough defended with its afore mentioned capabilities actually adding to task force defence as well as providing additional strike / CAS support for the troops when they go ashore.
There could be a single large squadron of F-35B providing a flight to two of the carriers or three small squadrons doing the same with the other carrier either serving in the LPH role, covering off for one of the LHDs, or in refit itself.