You still need somewhere to store the vehicle. As the airport keep cannibalising vehicle parking areas to turn them into aircraft stands, I suspect there is also a shortage of space for a vehicle/s capable of storing all the palletised seating required. Also, assuming the handling contract remains with Servisair (as for the mail flights), the timings coincide with one of the peak evening periods where there is already a chronic shortage of men and equipment and I doubt that any additional expenditure will be forthcoming to ensure that a full team, plus hi-lo loader, will be available for the period of time required to convert the a/c from pax to freighter. We shall see however.