The issue isn't with either DME or RAC. It is with JB...if you are flying with a lap baby, you must checkin at the airport in order to prove the age of the child. There is no way around it that I know of. Can you use DME? Absolutely. But you can't use RAC. Your entire group has to be able to checkin at the same time....so,no you can't check bags or get boarding passes at the resort. You can take the DME bus back to MCO, with your bags stowed beneath it, and then take your bags with you to the JB counter to be checked in and given boarding passes.