I can imagine the feeling of "empty yard" . May I suggest to open your heart and your humble household to some rescued dog?
It won't be easy to find one for the job you intend him/her for.
But, at least you can try. When I was adopting my Chihuahua, I asked the Shelter if I can take her home for couple a days, without obligation to adopt and I will see how she is with the chickens...
You can do the same, I suppose....
You mentioned neighborhood dogs. For that reason, you need to look for rather big dog in size, so he can intimidate the other dogs.
There is no assurance that any breed will be good for the particular job you need him for.
You will be very lucky to find one, that just do everything you want him to do, on his own.
With some dogs, it may take little training and with some a lot of training.
There are several recommended breeds for Livestock Guarding:
Great Pyrenees
Anatolians
Akbash
Kuvasz
Komondor
St. Bernard
Border Collie
Karakachan
Don't be discouraged in case if you should find some "mutt" that he won't do the great job as well!