Just for information purposes, my experience of DJI customer service has been rather poor. Having discussed this subject with several people i have decided not to put all my eggs in one basket. A colleague of mine is building 3 Axis gimbals for a fraction of the price of a Z-15. I am waiting to see them in action but it is a more cost effective option if they work. In the beginning i relied on DJI for their plug and play functionality but with hindsight it has cost me dearly.
Due to a series of expensive crashes it has been necessary to be more philosophical about the mess i am in; thanks for your concern.