Really, hunting is instinct. You can't convince a cat NOT to chase the birds. What you can do is put the bird-feeders very high up and in a very cleared area, so the birds can see the cat coming.
Even better, keep them as Indoor-Only cats. They'll live 3 to 6 years longer than cats that go outside. The won't get lost, killed or hurt that way.
I recommend going to the Petfinder site, & looking for your local cat-adoption organization. Many of them know a lot about their charges' personalities.
Adopt TWO cats. They'll be company for each other when you're not home, and can play together.
There may be a sibling pair, or pair from the same home that would like to be together.
And don't go in with the idea of "young cat... young cat". It never works out that way. I went to adopt a 1-yr-old or so cat for company for the cat at home, and came out with a totally charming 7-year-old ! She was one of the most wonderful cats I've ever had.
"That house is doubly blest / Which to our feline friends gives rest." (The Black Cat, 1941 movie)