I don't know of every brake made, but in over 40 years, going back to when cantilevers were SOP on European bikes, I've never seen any canti brake that didn't have a way to align the shoes without bending the posts.
Something is seriously wrong, or you're missing or mixing parts. Check again, or find documentation on setting up those brakes. Know that the posts are aluminum, and you bend them you could create a real risk of them breaking instead of braking.
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