I think this discussion shows that you can't write SOPs for every conceivable occurrence and that Airmanship is thankfully still alive and well in some quarters.
I'm sure at the back of their minds was the possibility of needing to rapidly shut down an engine if it actually went into reverse (very unlikely, even at that stage, but...) and having the gear down at that point wouldn't be a great help.
The same sort of thing could be said of the BA38 double engine failure on short finals: the QRH is written assuming that there's reasonable time available for relights, not that you're going to be on the ground in 40secs...