IIRC, the Type 42 Batch 3s weren't stretched so much as they were using the original design, rather than the cut down version that the first two batches were.
Or heck, just remember to replace Victorious' worn out boilers and machinery on the first go and use the time and money save to modernize Implacable as well.
Given the occasional idea of having Britain and France jointly develop nuclear submarines, what about including Italy in the mix? In the late 1950s, Italy was looking at building an SSN and SSBN based on the USN Skipjack-class. They were also apparently developing their own SLBM as well.
From an industrial standpoint, France actually builds the eight pre-production Mirage 4000s requested by Saudi Arabia and secures the Saudi order for 300 aircraft.
F-15 Eagle model with AIM-54 Phoenix missiles mounted on FAST packs
Lockheed Martin QF-35 Lightning II
Stealthy tailless F-15E variant proposed by McDonnell-Douglas for South Korea's F-X program.