These aren't buffets, so perhaps they are way off the mark, but are pirate themed:
morning boat trips for kids only:
WDW Pirate Adventure Cruises
evening boat trips for adults and kids:
WDW Pirates & Pals Fireworks Voyage
On the other hand, while not a buffet, Whispering Canyon Cafe does have an "all-you-care-to-eat" dinner platter option that might work. No pirates, but perhaps cowboy or old west themed attire could work for your grandchildren (if they would want to dress up).
I haven't tried the Garden Grill, but it might work if you want characters (and since you already have plans for Chef Mickey's).
The Tusker House in AK park might be good if you want more non-standard food options (and yes, I realize this is also known as the Donald's Safari Breakfast).
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