Depending on the country youre in, I'm not sure there is one. Aircraft performance reqmnts are different to that for airspace procedure designs and if a gradient is not expressed, its either 3.3% or 2.5% for a MAP
These airports in my limited experience are all on the coast, ie no terrain when you climb out to sea.
So, either turn out to sea and know your safe, or you can either climb to remain visual until above the 25nm MSA (usually very low seawards of the coast), climb outbound above the DME steps on a suitable track if there are any, or alternatively follow the single engine escape procedure for that RWY which will get you safely above MSA or into a hold somewhere.
Someone else may enlighten us both further.
Cheers