Throwing in my lot here (as a PFA coach and an FI), you can do the dual flight in a PFA permit aircraft (it is not a flight for the purpose of gaining a licence or rating) but, in any case whoever you fly with, whether coach, FI or examiner will need to be qualified to fly a taildragger (ie tailwheel difference training completed and signed up in their logbook, unless they had previously flown taildraggers before that rule came in and threfore have grandfather rights!). Dead simple really!!
