There is an 'official' recipe thread on the Cooking board here on the Dis. I checked, and don't see the Kona Bread recipe there (forgot to check for the butter while I was there - sorry)
Anyway, you can request recipes on the thread as well, and they are pretty serious about getting Disney Recipes. Hopefully someone can help you out.
Also, did you know that at most places will give you the recipe for an item if you ask? I was at Mama Melrose in April 2007 and just commented that I really liked an item. Our server went to the kitchen and got the recipe for us!
http://www.disboards.com/showthread.php?t=1777635 - Recipe Thread