Hi JT,
How do you intend to account for the progressive clean up from the landing configuration to the missed approach configuration to the enroute configuration .. with varying gradient capabilities throughout ? Not to mention the hills here and there and the possible need for turns ?
In my company, if the published MAP climb gradient is >2.5%, we are required to calculate the "Approach Climb Gradient" (from the lap top) using Estimated Landing weight, Airfield conditions, Landing Config. If we can't make it - then we have to use the higher published minima.
If we can satisfy the required OEI climb gradient, and we suffer an engine failure then we raise the acceleration altitude to MSA or 1st published stop Altitude or level acceleration Alt (when published).