Once flaps are selected, they should not be thereafter raised during that approach - you're committed.
Unless your a 777 on final Heathrow, both engines out.
I do wonder at the numerous suggestions that during an EFATO that a lot of consideration should be given to strictly adhering to the POH, like flap limiting speeds "No slipping with flaps" etc. The priority is the pilot gets down and walks away unharmed and insurance sorts out the possible wreck. I know some will say that going outside the POH adds to the problem, but I'm not convinced.