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This is a solved problem in India [0] - and the system is brilliant in its simplicity[1]: Fixed function non-reprogrammable battery operated electronic units, no connectivity, randomization of voting units and a paper trail for verification.

[0] https://www.youtube.com/watch?v=vlHJZrXrnyQ

[1] https://www.youtube.com/watch?v=ZJReQ8ao0SU