Not a recipe, but I've seen it done. It involves cranberry sauce, so make a sauce however you do
The walnuts would be a nice addition. Layer the phyllo, basted with butter, put the wheel of brie in the center and top with the cranberry sauce. Fold up the phyllo, bake, and voila.
Despite the pastry, you'll still need crackers or something else calorific to scoop it up. Don't you love Thanksgiving?