HMS Ocean, etc
If " strengthening the decks and enlarging the lift would be a relatively easy task " - I don't want to see your idea of a hard job ! ( Unless I'm on the contract end of it ).
Simple fact is, Ocean should have always been fitted out as a cheap ' Plan B ' carrier, with a ski-ramp and that daft goalkeeper fitted otherwise than the runway centreline ( which seems to my cynical self like a Naval political version of " No - operationally useful -Harriers here ) ".
Much the same for Bulwark, Albion & Argus - I suggest we install a plan NOW that in event of conflict, at least 1 of our 80 + Admirals ( see The 2 Johns sketch on Youtube ) , and a high ranking politician, be aboard; if they knew in advance that might happen, we might get proper ship capabilities and air support inc' fleet defence...
Well I can dream.