New England Clam Chowder Dip

Name: New England Clam Chowder Dip
Ingredients: 6 slices bacon, cut into 1/2-inch pieces; 1/2 cup chopped green onions; 1/3 cup diced celery; 1/2 teaspoon salt; 1 pound cream cheese, at room temperature; 2 (6.5 ounce) cans chopped clams, drained; 2 tablespoons chopped Italian parsley; 4 ounces grated white Cheddar cheese; 1 teaspoon Worcestershire sauce; 1/2 teaspoon freshly ground black pepper; 1/2 teaspoon seafood seasoning (such as Old Bay®); 1/2 ounce grated white Cheddar cheese, or to taste; 1 pinch cayenne pepper