In Australia we have a robust and fast paper voting system administered by the Australian Electoral Commission. We get most results in the evening of election day with only really close races being a couple of days out. There is solid chain of custody on paper ballots and having been used for over a century we have all the kinks worked out.
The USA has about 330 million people, we have about 25 million. The voting population of each is smaller, but it is a much larger percetage of our population due to compulsory voting. If we can do it with less than 10% of the population it could be done there with the same ratio no worries, just assume out country was a state and you can see it can work.
Paper is safe and secure. It is well understood and all the hack and hijinks have been worked out. If you ask experts in IT if they think voting should be dine electronically they answer hell no without much debate.
Do you want a grilled human? Because that’s how you get grilled human.