Your request to not want to see US politics, or any topic, is fair. Especially given your view that it is your responsibility to filter, not others' responsibility to not talk about it.
Many people are so opposed to LLM based systems, that they've given up on regular statistical based regression filters. 🤷🏿♂️
You should be able to list topics that you don't want to hear about, and your client should score posts, and hide things that you don't want to see. You can do this without transformers.
Alternatively, BlueSky has composable moderation. Some human can read posts and tag as "US politics." Then you can subscribe to that filter, to not see it. Low effort for posters, good result for readers.
Telling people to add hash tags to everything is silly. It only makes sense from the position of someone in the default category, because they don't really think that they'll have to adorn everything they write with:
#white #male #whiteman #man #cis #dude #bro #ablebodied #whitepeople #pinkskinned #majority #justaguy #guy #caucasian #presumeddefault #stuffjustworksforme #benefitofthedoubt #thoughtoffirst
They presume themselves to be the default, and hash tags are for everyone else that deviates from their view of the world with them at the center.