ENG OUT ACC Entry has no effect because the crew have to push V/S to level off.. it is never done automatically.
Airbus SOP is to secure engine before levelling to accelerate .. so the actual ACC ALT may be higher than the entered value, depending on how many ECAM actions are required to secure the engine.
Magnetic Iron.. unless your company SOP prohibits it, you can say "continue ECAM" after a Flap selection, then "Stop ECAM" for the next selection and so on. No need to wait until the a/c is clean.