Everything is possible, but trying to use hindsight 65 years later we enter in the field of theories and hypothesis, impossible to validate with the facts actually available.
Maybe a listing of the planes used by NAGr.11 would help... if such a thing would magically appear...
Just to add one more hypothesis, even the civilians could have scrapped aircraft before the Allied took hold of the airfield, considering how much valuable metal scrap was then, but I wouldn't bet on it and it is very improbable that after Allied troops arrived they destroyed anything if not following orders... and Udine was occupied by the British 6th Armoured Division on 2 May, only one day later the Germans abandoned it, and I cannot imagine any British soldier looting enemy material if not ordered to.
But that's only my opinion, of course.