OK some sensible suggestions - but only for the exterior which I think isn't your problem
Omega Air Tankers
SAHA Air Iran
Spanish Air Force
Colombian Air Force
Brazilian Air Force
NATO Luxembourg (they have ones without the radar)
If its the interior you need then there are many museum 707s which might do.
Lastly, I can't see the problem with JT's 707. Most US TV shows people boarding a Lear Jet but once in the air getting up and walking around and then getting out of a Gulfstream at the other end. What's their problem?
SGC