While the original recipe for Briochets Veneziane alle Mandorle calls for specific ingredients to achieve the perfect texture and flavor, there are some possibilities for substitution. For example, if you are looking to make a dairy-free version, you can replace the butter with coconut oil or a dairy-free margarine, and the milk with almond or soy milk. If you're unable to use eggs due to dietary restrictions, a flaxseed egg or commercial egg substitute could work, though it may slightly alter the pastry's structure. Additionally, for those who favor different nut toppings, chopped hazelnuts or walnuts could be used instead of almond slices. Just remember that any substitutions may impact the final result, so it might require a bit of experimentation to get it just right.