Do you already have some chickens?
I here that silkies are not very cold resistant, and here in can get below zero. What did you think?Cochins are a breed that are more likely to go broody than many, but with any breed there’s not a guarantee that an individual will. If you did get a couple and one went broody I imagine she would do fine raising ducks, many chickens have before. Silkies are a good option if you want broodies as well, they’re probably more prone to it than cochins. I’d say get 3 or 4 at least, that way you have a better chance of a broody when you need it, and they wouldn’t get lonely.