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Still sounds to me a turbo and cam change to give later closing of inlet valves will do what you want, small turbo, comes in below 2000 rpm but not much boost at 6000. you could get a huge increase in torque over a wide power band. Have you driven a vw golf 1.2 turbo? have a look at the specs...
I am currently working on a magnaflux machine at a aircraft engine company at the local local airport, there is a diesel aircraft engine there they have just worked on, it replaces a 350 cu in gas engine with it's 2L diesel similar power but better at high altitudes, 40% fuel savings, much lighter too. It is basically a mercedes van engine, but with an aliminium block, turbocharged as normal. I think it's actually VW in origin, as the mercedes and VW vans are made in the same factory with mainly shared components.
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