There used to be a procedure in the FCOM for Engine Out above two engine acceleration but prior to flap retraction or engine out acceleration.
-advance THR to MCT, Select Speed
-stay on SID
-Complete initial ECAM to engine shutdown
-Manage Speed, retract Flap on schedule (in normal circumstances there should be sufficient performance to climb and accelerate)
- if not accelerating then VS 0, once clean then Open Clb at green Dot.