I agree with HERSEY - there is no reason to cancel. Just ask to speak with the chef and they will personally take care of your meal. Disney Chef's are very well known for this. Also - how do you know there are no peanuts in the Concourse? Every restaurant has peanut butter on hand. The good thing is NO Disney Restaurant is allowed to use peanut oil.
Anothing thing to remember, menu's change all the time, how do you know that the item in auestion ie even still on the menu, or will be when you arrive? Remember, these websites are unofficial and not always up to date. Disney does not post menu's on any of their websites.
Call 407-WDW-INFO and ask to be connected to Brenda Bennett, she will personalize your itinerary and contact all the chefs that you'll be dining with. If you request, they will call you back to confirm.
Email me for more info-