Use a fine-quality dark chocolate, not baking chocolate, for the garnish. Or substitute milk or white chocolate, if you prefer.
Have an extra mason jar or two on hand, in case you have enough cake rounds or scraps and filling to make more servings.
Use a cooler to transport the cakes to a potluck or other gathering. Bring the whipped cream and cherries in separate containers and garnish cakes right before serving.
For an alcohol-free dessert, simply omit the cognac.