Please tell your TRI that the aircraft will make the 5.5% required climb gradient; otherwise, you were not legal to takeoff at that weight to begin with. This assumes that (1). There is no S.E. procedure, or (2), if there is a S.E. procedure, you've past the indifference point upon which the S.E. procedure and All-Engine-Operating SID are predicated.
If the aircraft cannot make the SID's required climb gradient, you must:
(1) Select another departure path, or (2) Reduce takeoff weight to make the SID gradient should an engine fail, or (3) Have a S.E. procedure.
Worrying about 'what if' after takeoff is stupid.....and illegal.
Fly safe,
PantLoad