Prepare the Crust: In a food processor, combine the crackers, arugula, spinach, and olive oil. Pulse until the mixture resembles wet sand. Firmly press this mixture into the bottom of a 6-inch ring mold or springform pan.

Mix the Filling: In a mixing bowl, blend softened cream cheese until smooth. Fold in the chopped shrimp, cucumber, shallot, chives, lemon zest, lemon juice, and Cajun spice mix. Combine until creamy.

Assemble the Cheesecake: Spread the filling evenly over the prepared crust using a spatula. Ensure the filling is level.

Chill the Cheesecake: Cover the cheesecake with plastic wrap and refrigerate for at least 15 minutes to set.

Garnish and Serve: Remove the ring mold and garnish with dill, whole shrimp, and chive blossoms. Serve with toasted baguette slices or crackers.