Done. Thank you for your quick reply, @missoverexcited.
Just for the benefit of anyone else who might need to do this, be sure to contact Magical Express directly at (866) 599-0951. This number is not listed on the main contact-us page on the WDW website. I had called Hotel Reservations, as this seemed to be the closest to the subject I was calling about; I waited on hold for about 45 minutes and the CM gave me the above number to call instead. When I called ME directly, I was on hold about six minutes, and the CM took care of me right away.