That kind of negates the usefulness of the two carriers.
There’s no point in spending billions if they can’t fulfill their function by, they will be emasculated if the full complement of Bs are not acquired.
As may have more range and weapon load but that advantage is totally negated by having a mobile airfield, for recent examples just look at the land based aircraft performance over Libya, it was a joke compared to the carrier borne performance even compared to rotary wing.
The reasoning behind having two carriers was availability - getting two got us something like constant ability for 8 years straight with programmed refits - I don't recall anyone presenting the idea using two at the same time was a serious requirement - there will be occasions when it can be done but it wasn't presented at any level as a strong use case. The RN simply didn't want to be in the same position that the French were with one carrier - and have to endure long periods of no availability.
I take your point about Libya - I did find it immensely irritating that having junked fixed wing aviation, the armed forces were then pitched into a campaign vs a country where a considerable amount of the fighting could be done in easy reach of a Harrier, with no decks to fly off.
Instead AH-64's ended up doing the heavy lifting - with very little top cover or fast jet availability for much of that time.
Really don't want to do that again.