Aurel 90
You raised very interesting topic which I had got clarified from airbus also. With dual engine flame out APU must be started anyway to get out of EMER ELEC. When Windmilling is insufficient then only you will get in G+Y fail and since hydraulic fluid is available ECAM will ask you to put on yellow electric pump that also gives you flap and reduces landing distance but it will ask to switch off PTU as the yellow electric pump fluid turn over is only 32 l/min as that of EDP which gives 140 l/mt. otherwise G+y will remain. Good thinking.