[alistairSH]

Are you suggesting mail-in ballots as a universal option that covers everybody? That seems unfeasible logistically. Does any large country offer universal mail-in ballots?

Yes, universal. Oregon (USA) has used universal vote-by-mail for many years now. It's widely considered one of the best systems in the US. Voter rolls are updated by the DMV (or via state websites), everybody receives a ballot by mail prior to the election. Voters can return the ballot by mail, at a drop-box, or they can choose to vote in-person. Voters don't have to vote any earlier - as long as the ballot is post-marked by election day, it will be counted.

https://en.wikipedia.org/wiki/Elections_in_Oregon https://states.aarp.org/oregon/election-voting-guide