All good stuff i'm sure guy's, but not very practical when you have to use the information for real in anger!
The standard ICAO required MAP gradient is 2.5%. Where an increased gradient is necessary for terrain purposes, this will be stated. However, minima are still published for the standard 2.5% gradient, abliet with a higher value.
I suggest that you refer to your AOM or Performance manual, where the achievable Landing Climb and Approach Climb gradient will be published according to configuration, weight and environmental conditions. You are then in a position to select the appropriate minima, considering the possibility of a donky failure at any time, of course. Always have an escape route!
Regards,
Cuban_8