Back in '98 - '99 when I was either working up to deploy or already deployed to the Med, a team from NAVAIR came out to the NASSAU (LHA 4) to check the aviation spaces for MV-22 compatibility; as I recall, "high-hat" space (aka a tall hanger) was the first issue. Fuel capacity was another and test aboard WASP high lighted the flight deck coating problem. Throw in a different set aviation calibration requirements and potential magazine storage issues (i.e., small arms for side mounted machine guns versus 500 to 2000lb bombs) … sure can get pricey.
IIRC, the hangar is tall enough, and most of the magazine space requirements can be satisfied by insertion of blast doors and reassigning space.
There are two major issues with the ship itself, leaving the pilot and deck crew training aside. One issue is the deck, this is not complicated to remedy, but is costly to acquire, and also costly to maintain due to the ablative nature of the coating. The fittings for emergency recovery and arrest are mandatory, I'm afraid, you need those because you want to be able to recover damaged fighters.
The second issue is bunk space allocation. Every naval ship has a watch and station bill, or scheme of complement, and these positions are ferociously argued over with organisations virtually coming to blows regarding the number of bunks and positions on board. Since the majority of the bunks on the Canberra class are army, guess how likely it is that Navy would be able to resume any of them? That means we'd need to wear it out of hide, and we have an unfortunate nature of minimising bunks on Navy ships. So not only would we have a massive fight on our hands should we attempt to take any Army bunks, the knives would come out should we seek to reallocate whatever bunks we have in Navy hands. Not a fun thing, and this isn't even going into some of the incredibly complex and expensive whole of Navy issues like training requirements, Navy mission, Navy personnel requirements, and the pesky Defence Act that states unequivocally that FW are the domain of Air Force!
And let me tell you, Air Force members do
not like staying anywhere other than resorts!