One thing to keep in mind about these paces is that the length of the recovery doesn't matter that much when you're running slower than lactate threshold. You aren't building up a lot of waste products that need to be flushed during recovery intervals. The main stress of this training is the fuel depletion and the mechanical fatigue on your legs. So the main concern is just getting in the total volume of pace work.
Another advantage of breaking up your pace work instead of doing it all in one shot is that you get more practice locking in your pace. It's much easier to lock it in once and sit there than it is to repeatedly change pace and get back to where you want to be. I find that the more I do that, the more MP starts to feel like muscle memory.