If you can't find or don't have access to Swerve Brown and Bocha Sweet, you can use 1 cup Swerve Granular plus 2 teaspoons molasses or Yacon syrup. Each serving will have an extra gram of carbs and the filling may recrystallize a bit upon refrigeration.
You can also try replacing the Bocha Sweet with regular xylitol. It should give the same gooeyness to the filling. Please be careful if you have dogs because it is highly toxic to canines. Serving: 1/2 recipe | Calories: 319kcal | Carbs: 2.8g | Protein: 5g | Fat: 30.7g | Fiber: 1.7g