Many people would appreciate homemade challah for Shabbos Hagodol as they don’t have a chance to bake any. If you get the word out to friends, family and neighbors I’m sure they’ll be gone pretty soon.
Or call your local “Shabbos package” organization, or perhaps a Bikkur Cholim.
Maybe I’m selfish, but I wouldn’t want my perfectly good, slaved over challos to go to the birds…