Ok so basically the CFCA engine and its bolt on parts are very good except for the EGR valve. All CFCA EGR valves will fail it does not matter if it’s a D variant they can and do fail.
With this in mind if you have had a full engine replacement with absolutely everything replaced costing easily upto £14k it doesn’t make sense to leave a little ticking time bomb waiting to kill your engine again. You can go three routes now.
1) Leave to EGR in place and accept the inevitable.
2) Find a good VW engine specialist to try to retro fit a reliable EGR off of a 140 BHP VW engine.
3) Blank the EGR and fit a Non DPF exhaust pipe and have the engine remapped. Then find a tame and understanding MOT station to help you get your VW through its yearly tests.
Good luck with your quest.