If you don't ever give your network credentials to the Smart TV you've closed off 99% of the attack surface.
From previous discussions there are apparently TVs which will connect to any open network nearby, if it can find one.
I got myself a normal, non-smart Philips 49" TV some ten years ago, it's good, but I don't expect to be able to find something similar anymore.
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From previous discussions there are apparently TVs which will connect to any open network nearby, if it can find one.
I got myself a normal, non-smart Philips 49" TV some ten years ago, it's good, but I don't expect to be able to find something similar anymore.