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I was under the impression that the Purina Flock Raiser was acceptable from hatch to laying.
It is. You can also have feed locally milled to your specifications that would be suitable from hatch on.
Also everyone needs to keep in mind that "crumble" is just the final physical appearance of the feed. It is not a class of feed in and of itself. You can purchase "crumble" of many different compositions for many different types of bird -- regardless of age. Just as you can buy "pellet" in many different types of feed - starter, grower, finisher, layer, etc, etc. Crumble is not a feed, it's just what any given type of feed might look like.
To the OP ducks are different, but I wouldn't say any more complicated than geese. Understand what they need -- ample protein, vitamins and minerals, clean water -- and provide that and you'll be just fine.