Make the chocolate bottom: Place the coconut milk, sweetener, and vanilla bean seeds in a saucepan over medium heat. Once the mixture is simmering, remove from the heat and stir in the chopped chocolate until the chocolate is totally melted. Pour 2 tablespoons into each of eight 2-ounce jars or small glasses. Place in the fridge to harden a bit, about 30 minutes.
Meanwhile, make the filling: Place 1 cup of the coconut milk in a small saucepan. Sprinkle the Further Food gelatin over the milk and stir until dissolved. Add the mint and sweetener(s) and heat the mixture to a bare simmer. Remove from the heat and add the remaining 1½ cups of coconut milk and the salt.
Transfer the mixture to a blender and process until it is extremely smooth and the mint leaves are completely pureed.
Pour the mint filling over the chocolate bottom in the jars. Garnish with mint leaves and place in the fridge for 1 hour or until set. Store in an airtight container in the fridge for up to 3 days, until ready to serve.