We did this at Christmas took ME to our first resort then hired a car for the bit in the middle, we booked it before we went. Choose one of the UK car hire firms (we used USrentacar.co.uk ) and in the menu where you select pick up location we chose Disney Car Care Center. This is run by Alamo and is close to MK. We had concierge call Alamo to arrange for them to collect us and take us to the Car Care Center (the front desk at the resort can also do this) We arranged to drop the car back to MCO but you could also drop it back to the Car Care Center and go back to the airport on ME. The cost was the same as if we had hired the car from the airport.