Actually, You can still us DME even if you stay offsite. That is, if you stay right by the airport. We stayed at Residence Inn Airport. They had a free shuttle to/from the airport. After our nights sleep, they shuttled us back to the airport and we took DME to POR. You need a reservation, that's it. To not confuse the DME people, we gave them a flight that landed on our WDW check in day and we were set. The Residence Inn driver even dropped us off right at the DME check in area.
Duds