Bear in mind also that in most twin engine aeroplanes that you won't get 3.3% on one engine.
The CAO 20.7.1B aeroplanes will give you 1.6% nett (97ft/nm) 2.4% gross.
Any aeroplane that gives you more than that is giving away payload unless it is grossly overpowered - the B1900D might be in this category if what people tell me is true.
It surprises people how "badly" the aeroplane performs on one engine compared to on two - the 737 typically has 2 engine climb gradients of around 14% - dropping back to 2.4% is a huge reduction.
I guess the point is that you won't get to fly the SID on one engineunless you take a huge performance penalty in terms of uplift.