I would agree that the grass runway would be a challenge, but if it was just a landing, maybe possible ? This would have been in the 70's. Long time ago, in the winter, someone else guiding the way. This :-
Constellation Air France shows the history of the Tousses Conny and a photo as 6V-AAR. The runway length and surface at Toussus suggest that that would be the answer, but my memory says different, maybe it was implanted by that UFO ;-)