These fine folks should file to have their districts protected by the Voting Rights Act.
Why bother? They already get their own district: CA-1
Districts, plural. One is nice and two is better. The claim would start with Del Norte County being made to suffer agony by being placed into Congressional and legislative districts thrust into the Bay Area rather than obtaining representation of their own values and interests. The same is true with Trinity County in the state Senate map.
So take Nevada county out of CA-1 and put all tiny Republican counties you want into it, lol. CA-1 is underpopulated and in decline anyway, they could just add Del Norte outright and not much else would need to be changed.