I would Switch the crew oxygen sytem off initially (which you can in an Airbus330.) I would then procure an oxygen bottle from the cabin for each of the flight deck occupants, re-familiarise myself and LHS pilot with it's operation and communication facilities. Continue flight safe in the knowledge that should there be a subsequent sudden and rapid decompression (either self-induced to remove smoke or fumes, from an electrical failure or from airframe damage) that we in the flight deck have sufficient oxygen available to sustain us as we descend to a safe altitude.
ie I would replace a system, which is for emergency use only, with another. Of course this is not a dispatch condition, but nor would I treat it as an emergency, only abnormal.
I imagine that the original described scenario has lot some of it's nuances.
Last edited by beardy; 26th Jul 2013 at 07:31.