An interesting idea but one that's largely not sustainable due to the UK's funds or lack thereof.
As has been said, it would be lovely to have the Warspite as a museium, but she was basically a wreck at the end of the war, the Fritz hit and the mine damage she suffered would mean that she was nearly a near TCL and to get her back into a condition to be a museium would have meant some serious work refitting her. IIRC the Rodney was utterly worn out by 1944 and was good for little more than surface bombardment. The Renown was also worn out as was Furious.
If there was the money and will then keep one of the QE's, probably the Queen Elisabeth herself. The Valiant was badly damaged in a dry dock collapse and never really returned to service, and the Malaya was exhausted. The R's, Nelsons, Renown, all the QE's would probably go to the scrappers yard and the KGVs instead would be left as the only BBs in service and joined by the Vanguard.
You'd want to scrap/sell any cruiser that isn't a Town or Colony class. The rest can be sold and scrapped.
The CVs - Scrap Furious, retire the most badly damaged AFD's, as I recall that one of them never could hit her max speed and had problems with her rudder following damage sustained in the war (I think it was the one stuck at Malta). You'd definately want to finish the Audacious class, at least 2 (Ark II and Eagle II) and maybe, maybe if you could, get a Malta done. The AFDs because of their design are not worth refitting. We saw what happened with the Victorious' refit, hugely expensive for very little actual performance.
So, keep the Implacables, at least 2 more AFD's to give you 4 decks. Retire the other two ships when the Audacious' complete and keep working on the light carriers as they were perfectly fine and were actually more flexible than the AFDs as was proven.
But the biggest problem is money or a lack of it, the UK was massively bankrupt, and there was a series of very expensive failures in government spending when it came to the armed forces, combined with the austerity of the post war period. The problems not hulls or tech, its money and the development of future weapon systems. And ensuring Duncan Sandy's gets hit by a car.