And definitely not something that will attract government attention when you're repeatedly registering, no sir.
For that matter, when I was a poll worker, we had a computerized system, even though we did paper ballots, which noted when someone had already received a ballot regardless of where in the state they received it.
But as to your second point, it absolutely astounds me how many people seem to be completely unaware that early voting is very much a thing for like weeks before election day. Why would they need to do it in a single day?