"Dr Latifa" and HB-HOX
That is a great story. Gertrude Dyck arrived in Al Ain in 1962, so perhaps just after your adventures. She was a Canadian nurse, who was one of the first white women in Al Ain. She worked at the local "Oasis" Hospital until 1988. As there were few doctors around, she often had to do more than nursing and was always called "Dr Latifa" by the local people. I last saw her in Al Ain in 2004, when she showed me the photo of the Twin Pioneer on a medical mission.
The nearest Twin Pioneer to me here is the one that has sat dismantled at Sion airfield for a number of years (at least until 2005 - I have not been there since). It has no engines or tail and is still marked "Mensuration Cadastrale Suisse" (Swiss Land Survey). Its wings are alongside and pencilled on the root of one is: SAL/TP/00469. Although no registration is visible it was HB-HOX.