I would have thought it worth investigating as it is adjacent to the boundary and temporary access would be possible. as pabley highlights, there is already a route into Airport Way. The car parks have, naturally, direct access from the main road at the roundabout - they might need a set of traffic lights. This would take a considerable degree of pressure off the mid-term arrangement. According to G maps, part of the parking area is already being used by Airparks Shortrun.
In the famous words "How difficult can it be?"