Although the Comet was an achievement of the highest order, it would seem to me that with the cost af avtur being what it is today, a far better project would be to get a Vanguard or Brittania flying, the fuel cost of which, would be considerably less.
Let's not forget, the Brits were far ahead of the USA with turbine (and especially, turbopropellor) powered airplanes.
In spades.
Says me, who operated RR Dart-powered airplanes for quite sometime.