Why would you need to hack it from the parking lot, when the machines in the cities are all run by crooks?
“...the machines in the cities are all run by crooks?”
The machines are under the security control of your county election administrator or your county clerk. You vote for the county clerk and the county hires an election administrator. If you think they are crooks, why not vote for a different county clerk or ask your county commissioners the qualifications of the person they hired as a county election administrator. People are not pulled off the street to run elections.