Why not just do a mail in ballot? Then, everyone who is registered and can drop an envelope into a big blue box is able to vote effortlessly. The only people who would be sidelined are the homeless, and they can just walk in and vote in person if they feel the urge. We do it in the NW and it works great.
...Unless of course if part of the resistance to mail in voting in the rest of the country is due to fear of making it too easy on the poor and minorities...