I would do the apple bread and bacon first at 400. Wrap the apple bread to keep it warm and put it aside.
Crank the heat up to 450 (are you SURE it needs to be that high? That's close to broiler hot) for the Quiche crust, then back it down to 375 for the croissants AND quiche (the quiche will just be done a little faster).
The last five minutes or so, just throw the bacon back in to warm it up, or put it in the convection oven. If the apple bread needs it, it can be 'perked' up in the oven the last 5-10 minutes as well while everybody is coming the the table.
Sound good?
-m
ETA - An excellent use of your microwave convection oven (assuming your plates are micro safe) is to warm your plates. Keeps the food warm much longer, which I have found to be a problem especially with breakfast food for some reason. Good luck!
Wife to Jonathan
Mom to Sophia 12/02 and Amelia 12/04