As I understand it, the terms of the ITAR and purchase agreement preclude 'actually' running it, but possibly don't preclude getting it into a runnable condition. As you noted, one of the biggest, if not the biggest hurdles is serviceable Speys, I imagine the installed pair are probably well beyond saving having had no anti-det runs and periodic outside storage thrown in for good measure. Whether the Duxford or Hendon Speys are an option is highly debatable too and of course the first item on the agenda is to actually get 582 dismantled and moved to Bruntingthorpe!
-RP