Sorry, slow response to this.
Eventually I caved and went with a new EGR and did not go for the delete. Ultimately, I decided that I'm a cyclist who does miles of city cycling each week. I benefit from reduced polution and so shouldn't be a hypocrite.
Subsequently though I've noticed that my DPF is doing a regen about every 100 miles which is really too regular. Turns out it is at 40% of life. At this point I'm starting to wish I'd gone for a full emmisions delete (EGR and DPF) and to hell with being a hypocrite....