For point 2, you could put the very local questions on a separate ballot with a separate unique identifier per voter. It would be mildly inconvenient though.

For point 2, you could put the very local questions on a separate ballot with a separate unique identifier per voter. It would be mildly inconvenient though. Someone should be observing the voter taking the strip of paper, but it would be done in a way to prevent them from observing which one was taken by the voter.