If the center permits it, I do not think there is anything to stop you taking all exams on the same day. Like Nightsnorkeler, I was in and out in under an hour for each exam. Especially with Ethics and Representation, you either know it or you don't.
There is no provision to take the exams at home and I have not seen anything that suggests that will change. In any case, I would be very cautious indeed. I have used an online proctoring service once, for a college course. It was a horrific experience - half an hour to check my credentials rotate my computer and move some paperwork from a desk on the other side of the room (bills for payment). I was constantly pestered to adjust the angle of my screen, which meant that I could not always read all of the screen due to glare. I had to give access to my computer and they played about with settings - so quickly that I could not see what.
Compare that with Prometric. They are civil and business-like. They treat you like a human being. Trust but verify. You take very little into the center - not even a watch or your wallet. They provide all materials for the exam - scratch paper, calculator, pencil. My impression of Prometric is that they will have decent procedures in place that respect test-takers whilst maintaining the integrity of the exams they administer.