I think your plan is good; I would agree with double pumping at work at the times when she normally eats, if you can. A little oversupply will be a blessing if you are trying to pump full time - you can keep adding to your freezer stash. More women have the opposite problem (insufficient stimulation from the pump leading to supply spirals). I think it would be difficult to create an oversupply by pumping alone. If it happens you can always reduce your pumping sessions.
Me, DH, DD1 (5/2009) and DD2 (10/2011). DS due 6/2015.
I'm not crunchy. I'm evidence-based.
Vaccines save lives.