Re: oversupply and going too long between feedings?
Will she nurse to sleep? If so, I would do that. The white noise/swaddle/rock/pacifier routine sounds exhausting, at least when compared to nursing. I understand being worried about spit-ups while baby is sleeping, but spit-up isn't really a choking hazard because it's liquid, not solid. Liquid doesn't block the windpipe, because it can be coughed out. If you're really concerned, just have baby nap where you can see her. At that age, my kids napped in the swing, which meant that I could be working in the kitchen and still have an eye on the baby.
I think Phi has given excellent advice and information on scheduling and on coping with oversupply and forceful letdown. I can totally understand being stressed about the future and how an unpredictable eating routine will affect your ability to get out the door... But I'd encourage you to try to embrace your baby's unpredictable nature right now, and enjoy the fact that right now you have a lot of flexibility. As time goes on, your baby will become more predictable and once you go back to work, a routine will develop.
Coolest thing my big girl said recently: "How can you tell the world is moving when you are standing on it?"
Coolest thing my little girl sang recently: "I love dat one-two pupples!"