I think it should simply be this.
If a non-citizen votes, or ineligible persons vote, in a State for Federal office, then the State no longer is counted towards the Federal election. Those states with more votes than registered voters in areas, or illegals voting, or every one with a supposed sequential voter registration and all of them ending in ‘Zero’. They get caught and there voting isn’t counted towards Federal Elections and won’t be until they can prove compliance in the next election.
Elections are left up to the states, they are empowered. When you have power you have responsibility. It’s time for States to treat Federal ballots and Voters like banks treat money.
And refuse to seat their US Representatives and 2 Senators. Zero federal representation. No federal funds.
Heck. I’d even shut their post offices statewide.