Looking at the graphs in the AAIB report, it would appear to me that if the crew had brought the flaps up to 20 and and accepted a speed close to the F30 bug speed (i.e the go around speed) with the remaining residual thrust there would have been a very good chance of getting the aircraft down in one piece.
Under normal conditions, bringing the flaps up from 30 deg. to 20 deg. would take the engines out of approach idle (with thrustlevers at idle position and engine anti-ice off), reducing thrust to minimum idle.
Not sure if that factor would have influenced the circumstances on the already rollbacked engines in this accident. In other words, if it would have restricted the already limited fuel flow even more or not. Hard to tell as long as the cause of the restrictions has yet to be revealed.
Another recent rollback is under investigation:
NTSB investigates Heathrow-like Trent 800 engine issue
Green-dot