I was thinking more in regards of Cat and Trap cycles as that's really what holds back naval aircraft with regards to age
^ This, you can zero-hour components and try to make a worthwhile SLEP out of them but the more cost-effect option would be to buy MOTS and get F/A-18s
IMO the F-4 and Buccaneer mix would probably make it to GW1 at the latest before retirement to F/A-18C/Ds which would cut down on expenses by combining two supply chains. CVA-01 and 02 would probably soldier on until around the initial phase of GW2 before needing heavy SLEPs or retirement which would leave a gap between commissioning of the new QEs and decommissioning of the old QEs. To maintain fixed-wing capability I'd envisage basing the Hornet fleet between US carriers and CdG during the interim.
With the commissioning of QE and then PoW and delays in the JCA programme I'd not be surprised to see a batch of F/A-18E/Fs and possibly EA-18Gs (if we're really still committed to the fixed-wing game) to supplement the C/D fleet in the interim. Once JCA reaches IOC I'd wager that they would replace the C/Ds with them and maintain a mix of JCA and Super Hornets the JCA being common across both services allowing for embarkation as required. Helicopters would probably look the same with Sea King > Merlin and Lynx > Wildcat. AEW is an interesting subject as with CATOBAR capability we *could* operate E-2s but whether we would on grounds of cost or not I don't know. IMO it'd end up with either a small clutch of E-2s like CdG possesses or Merlin based HEW systems like the Italians use.
For FOC on QE and PoW I'd envisage the following air-groups
QE - Full Capacity
1x Sqn F-35C (10 Airframes) (Joint FAA / RAF)
2x Sqn F/A-18F (8 Airframes Each)
1x Sqn of F/A-18E (10 Airframes)
1x Flight of E/A-18G (4 Airframes)
6x Wildcats (HMA)
4x Merlins (HEW)
PoW - Standard Capacity
2x Sqn F/A-18F (8 Airframes Each)
1x Sqn of F/A-18E (10 Airframes)
1x Flight of E/A-18G (4 Airframes)
3x Merlins (HMA)
3x Merlins (HEW)
4x Apaches (AAC / JFH)