I see nothing wrong with it. I have 2 WH ducks in my mix. If you want you could separate the WH and breed them for some ducklings then keep the rest for eggs to eat.
If I read correctly you want to get another breed to live with you WH. I have all kinds of breeds housed together. I let them breed if they want. Imho that does not make you a bad person. Mixed ducks are just as cute and fun!