Yes, they should do all the things mentioned in the OP.
However, if the Dems really want to go nuclear, they should pass a new Voting Rights Act that includes a provision for “political reparations”. This would amount to something like a 10-year moratorium on white people voting.
You’d need to make sure you packed the Court with people radical enough to uphold this under Congress’s enforcement powers of the Reconstruction amendments.
But once you’ve done this, Democrats (and especially previously unrepresented minorities) should be able to win supermajorities in every state and amend the constitution however they with.
Never thought I'd have to use this argument against a maroon avatar but whatever:
The right of citizens of the United States to vote shall not be denied or abridged by the United States or by any State on account of race, color, or previous condition of servitude