It never hurts to ask. This exchange has NEVER been "official," but has been done regularly throughout WDW. When they made the "exchange dessert/drink for a side" official, it became much easier to do it and most CMs knew how to do it. Unfortunately, with the dessert being taken away and the exchange wording no longer appearing on the brochure, it has been seen much less. I would definitely ask at the time, but have a back up plan.
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