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I haven't worked with a VW TDI, but I don't think that will work. Diesel engines deliver fuel according to the driver request via the gas pedal, and unlike gasoline (petrol) engines they do not adjust fuel to match an AFR other than at full load where there will be a fuel limitation based on available air (to avoid going too rich and generating smoke). What a diesel engine does is to control airflow to ensure there is sufficient for the fuel delivery. I suppose ultimately that restricting air would put you on the smoke limited AFR level sooner, but you would always be pumping against that restriction so the net effect would be negative.
I'd suggest your best option would be to put a false throttled stop on your pedal to stop you going to high load and hence avoid high fuel delivery!
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