Maybe I am missing something here.
If you operate for 16 hours, the next 12 you will spend sleeping in the hotel.
Then you will be awake for possibly the next 12 hours.
Adding another 12 plus hours to this crew rest will allow you to sleep again and get your body clock back in order.
You cant operate 16 hours then operate back home and be alert.
Dont know where this would be allowed anyway.
Nor can you operate 16 hours, rest for 12, awake for 12 more , report for duty after this, I hope this is what they are trying to change, more rest, body clock adjustment etc, Sure this one is done often, but not so safe.
This is a good idea from the FAA.
Seems they may be waking up to this issue.