Some cats can somehow learn to keep the bell quiet! There's not a lot you can do, because many birds eat the seed that drops on the ground. I don't allow my cats out at all. I honestly think that's better for the birds and the cats. They'll both live longer.
If your cat is used to being outside, he'll hate being enclosed at first, so you'll need to provide fun toys. However, the best idea is to build a simple enclosure attached to the house with a kitty door and enclosed on all sides by wire. The structure doesn't have to be complicated, just 2 by 2's, a door for you to use, and some tree limbs and toys. Of course, cats love perches at different heights. Good luck!
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A dog, I have always said, is prose; a cat is a poem. ~Jean Burden