but we deal with flap retraction on our N-1 (to use the current parlance) missed approaches in exactly the same way as we would with all engines operating. We retract our flaps at Missed Approach Altitude.
Who says this N-1 nonsense is 'current'? Not here it ain't! For a start, it is fixing a number in your head (1) when you might have lost Nos 2, 3 or 4. I suggest we leave it across the channel where it belongs!
As far as possible, your OEI procedure should be as similar as normal procedure- fighting a failure is not the time to start remembering 'special' procedures.