Something to consider when doing anything even slightly out of the ordinary when it comes to DME:
DME is not owned or operated by Disney. It is a third party contractor to Disney (Mears) and has its own employees and operating procedures. Frequently, if you call Disney at the number mentioned above (or any other 407 939- number) you are likely to be given incorrect information by the Disney CMs, including that what you want to do isn't possible. That's not true, of course, but it happens a lot.
It's always better to call DME directly at 866 599-0951. There's almost never a hold time, and they're very efficient. Also, if calling Disney, the CM does not actually have access to the DME computer systems. All they can do is fill out the online form (same one you can fill out) and submit it to DME. If you call DME, the information will be entered directly into the DME database. Yet another perk of calling direct: you can request additional luggage tags if you need them. Frequently, if you give them a Southwest flight, they will automatically flag the system to send 2 tags.
Enjoy
Steve