I think the reason no one has done it is because while EGRs can be a ballache they are very good at reducing nitrous oxides, and these have fairly recently been discovered to have a seriously detrimental effect to human health. If the engine is maintained properly and on time, and driven properly (ie, not used regularly for journeys under 7 miles) then they're quite reliable.
But to answer your question, anyone capable of writing a performance map should be equally capable of writing out the EGR software so you can blank it, but it's getting harder to find firms who are willing to do that now.
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