If the idea of a MacRobertson Air race recreation did come about wouldn't Wroughton be a good place for it? The Science Museum have a Boeing 247 (unairworthy) in their store there and I'm sure you could rustle up a Rapide, BA Eagle and a Puss Moth to join the DC-2 and the Comet. Not sure about a Falcon or Hawk Major though.
On the subject of the Comet I've never seen any reference to it in the Grosvenor House Hotel or have I been looking in the wrong place? I would have thought a photograph might have been in one of the bars somewhere.