Elfboy's idea would make two new matches per division border, and since they're essentially seeded even though we would know the participants ahead of time we wouldn't know who's fighting whom, so it's basically 6 matches on one day's notice.
Cmdr's is even worse on the workload overall, since his way would require 3 matches per division border, though three of them would be known from week one so the same number of one-day writeups.
Either way, we've still got a week that, with your new setup, would be the heaviest one-day workload we've got. Weeks 5 and 6 will have four total matches that need to be written on one day's notice. Both of these would have six.