Narcoossee's personalized our menu with a simple message of "Happy 6th Birthday... my nephew's name" I didn't make any request, it was noted in our reservation and Narcoossee's was our first night dinner. They also had his bday button ready. Funny how the resort didn't have one for him.
So in short, yes how, Disney magic! At least that's what I told my nephew. I'd call the restaurant directly. They were very accomodating so I'm sure if they can reasonably do so they will.