Preheat the oven to 350F and line a 9 inch springform pan with parchment. Mix the almond flour, cocoa powder, melted butter, sweetener and salt, press into the pan and bake for 10 minutes. Cool and reduce the oven to 325F.
Beat the cream cheese and sweetener for 2 minutes until smooth. Add the eggs one at a time on low speed, then mix in the sour cream and vanilla. Divide the batter evenly among three bowls.
Whisk the cocoa powder and heavy cream into a paste and stir it into the first bowl for the chocolate layer. Grind the freeze dried strawberries to a powder and stir it with the strawberry extract into the second bowl. Leave the third bowl plain vanilla.
Pour the chocolate batter over the crust and smooth it out. Spoon the vanilla batter gently on top in dollops and spread carefully, then repeat with the strawberry batter for a clean pink top layer.
Bake for 50 to 55 minutes until the edges are set and the center jiggles slightly. Turn the oven off, crack the door and cool inside for 1 hour, then refrigerate for at least 6 hours.
Whip the cold heavy cream with the sweetener to stiff peaks and pipe a ring around the edge of the chilled cheesecake.
Drizzle with melted chocolate and finish with the sliced strawberries so every slice shows all three stripes.