How would you set up, oh say, the Catholic Church, or capitalism, or start a new country? I think what I suggest is a less daunting task.
It is already illegal to pay less than the minimum wage for most jobs. Making it illegal for all jobs is a small (but in any case, positive) step. Thus, any unpaid or underpaid labor would be immediately illegal. Since I suggested a weekly limit, it exceeds the time any firefighter would spend actively fighting a fire, or any pilot would spend on a single flight, or any surgeon would spend continuously performing a surgery. That makes your protests in this area a non-issue, I'm afraid.
"Do CEOs get to count flight time between their corporate office and their "conference" in Barbados as time worked?" Yes! Maybe they could adjust to using the telephone if the inconvenience of "work travel" became too unendurable. I would have no problem with that.
"What about the guy working two minimum wage jobs?" With the minimum wage set high enough and a tax structure which bookends it by limiting the maximum wage, nobody would need to work two jobs.
"Would teachers be legally obligated to stop grading exams and lesson planning at home ..." Yes, of course. Why do you think compelling people to work for free should be institutionalized?
Rome collapsed because, when they were on an unsupportable path, they stuck to it. They could have become more insular, withdrawn from foreign adventures of conquest, and survived. We are also on an unsupportable path and I would hate to see us not change it for lack of creativity.