lack of corporate experience with 2-crew, EFIS, ETOPS jets was one - just one - of the reasons why a fleet of 10 interim transport jets couldn't possibly be operating in support of the Herrick airbridge within a timescale of 9-months
It didn't take 9 months to convert Flight Crew and engineers from ancient analogue B737-200s to the digital B757-200ER. Why should the RAF be different? There's nothing particularly magic about 2-crew, glass cockpit, ETOPS aeroplanes.