In a large bowl, add the cream cheese and sour cream, and mix to combine. Add the currants, walnuts, scallions, curry powder and salt, and stir to combine. On a clean work surface, lay out a sheet of plastic wrap. Transfer cheese mixture to the plastic. Use the plastic wrap to form into a ball. Place in refrigerator for at least 30 minutes. Remove cheese ball from refrigerator and unwrap plastic wrap. Transfer cheese ball to a platter. Pour chutney over the cheese ball to cover. Sprinkle coconut flakes on the cheese ball to cover. Serve with rice crackers.