Stir together softened cream cheese, sour cream, dill, chopped fresh chives, fresh lemon juice, and salt. Cut cucumbers into 30 (3/4-inch-thick) rounds. Scoop seeds from centers of cucumber rounds, using a melon baller or small spoon and leaving a 1/4-inch-thick shell. Fill cucumber cups with cream cheese mixture; top each with 1 peeled Perfect Poached Shrimp. Garnish, if desired.