The fact that a proposed wind turbine sits in a low flying area isn’t necessarily a threat to flight safety on it’s own. The aircraft captain may be authorised down to 250ft MSD (or lower). If said turbine is marked clearly on charts/maps and there are no other factors (like the aforementioned low flying choke point or airfield safeguarding criteria) then the aircraft captain is to avoid that obstacle by 250ft. If there is an identified danger to MOD aircraft by this proposal then the MOD will certainly object.
I wish you well in your campaign but I wouldn’t necessarily rely on the flight safety argument alone.