I'm sure you're attached and it would be difficult, but you could rehome the male and purchase an adult female. Or, if you don't care about eggs, you could rehome the female and pick up another Drake.
I have heard of many people having an all male flock of ducks. The males are usually prettier and you don’t have the hassle of collecting eggs. We have a wildlife rescue in our area that ends up with a lot of unwanted drakes. They encourage people to establish an all male duck flock. Male ducks aren’t as noisy as females either. Having male ducks is actually a better option unless you are after eggs or have breeding plans.