Preheat the oven to 350°.
To the prepare crust, combine the first 4 ingredients in a small bowl; stir with a fork until moist. Press into bottom and 1 inch up the sides of a 9-inch greased (cooking spray or butter) pie plate. Bake at 350° for 7 minutes; cool on a wire rack.
To prepare the filling, combine the cheeses, sour cream, and the following 4 ingredients in a stand mixer; beat at a medium-high speed until smooth. Add eggs and egg yolk; beat until smooth. Spoon filling into prepared crust. Bake at 350° for approximately 35 minutes or until set (jiggles in the center, but is set 2-inches from the crust). Cool completely on a wire rack. Cover and chill at approximately 4-6 hours or overnight.
To serve, spread Triple Berry Curd evenly over top.
Place all berries in a blender, and process until smooth. Press the berry puree through a sieve over a medium bowl using the back of a spoon, pouring the half 'n' half over the sieving berries as you do so; discard seeds. Reserve any of remaining puree for another use; store in the refrigerator.
Whisk in the eggs into the puree mixture; whisk until well-incorporated. Sieve in (or with a flour-duster) the cornstarch, sugar/splenda, lemon juice, and vanilla. whisk until smooth. Bring to a boil in a small saucepan over medium heat, stirring constantly with a whisk. Reduce heat, and simmer 1 minute or so until thick, stirring constantly. Remove from heat and Cool.
Spoon the mixture into a medium bowl and let cool completely before serving with cheesecake.