In a smaller local election a few cycles back, I got to trial a paper backed electronic voting machine they were testing out for people who have dexterity or vision problems.

You basically got the same paper ballot as everyone else, but then you slipped it into the machine and it colored the bubbles for you after you selected the option on the screen.
Then you took your piece of paper out and handled it like a ballot filled in by hand.

Wasn't networked and didn't see anything that could tie you to a vote.
I got to share my appreciation for the concept, but concern about difficulty verifying it filled things out correctly, and the potential for touch screens to be difficult to use or act funny, all the difficulties of ux work to handle fixing an error, and the need for the UI to be exceptionally clear, which was difficult on the smaller screen with the larger font.
I think it also has screen reader support, but I didn't use it, so I'm not sure.