Yes, with a blanked EGR it will always have an insufficient flow code which will put the light on and also it will be running on default settings I think.
The only way to turn it off is to make the engine forget about the EGR using the software and then delete the code.
The IPF is about £500 though
Thinking I might have to go down the same route - I have the original spec EGR and I'm sure it's sticking at getting a flat spot at 2k. Not bothering with the new type ones cause they're rubbish so the next step is to map it out. Dear Father Christmas...
Not sure if the non-EGR maps can be put on with Tech 2 or not. Certainly Vauxhall can't do it because the EGR is required to comply with the Euro IV emissions from what I understand so all their software has to have it.
All that happens is the EGR section is just not present in the new software so the engine effectively doesn't know it's there so therefore it never opens and so never sticks.