Hard-boil the eggs: Place the eggs in a saucepan and cover with cold water by 1 inch. Bring to a boil, cover, remove from heat, and let sit 12 minutes. Transfer to ice water and chill at least 10 minutes.
Peel and halve: Peel the cooled eggs under running water. Slice each in half lengthwise. Put the yolks in a medium bowl and arrange the whites cut-side up on a plate.
Make the filling: Mash the yolks until crumbly. Add the mayonnaise, cream cheese, butter, pickle juice, mustard, half the bacon, salt, and pepper. Stir until completely smooth. For an extra-silky filling, press through a fine-mesh sieve or pulse in a mini food processor.
Pipe: Transfer the filling to a piping bag fitted with a large star tip (or a zip-top bag with the corner snipped). Pipe generous swirls into each egg white half.
Garnish: Top with the remaining bacon, a dusting of paprika, and chopped chives if using.
Chill and serve: Refrigerate at least 30 minutes so the flavors meld. Serve cold.