Pulse the shrimp in a food processor until finely chopped but not pureed. Transfer to a large bowl. Add the cream cheese, dill, tarragon, parsley, scallions, mayonnaise and sour cream to the food processor and process until smooth.
Add the cream cheese mixture to the shrimp along with the lemon zest and juice; mix well. Season with ½ teaspoon salt, a few grinds of pepper, and hot sauce to taste. Cover with plastic wrap and refrigerate at least 30 minutes and up to 4 hours.
Preheat the oven to 400 degrees F. Using a small serrated knife, hollow out the bread loaf, leaving a 1/2-inch-thick shell; set aside. Slice the cut-out bread into pieces and arrange on a baking sheet; drizzle with olive oil and add a few dashes of hot sauce. Bake until toasted, 5 to 8 minutes. Fill the loaf with the dip and top with dill. Serve with the toasted bread and crackers and/or crudites.