It depends on your dealer maybe???? On my Navara, the Head Service Guy at my local Nissan joint actually offered me a blanking plate for the EGR one time, I already had one fitted, I stopped short of telling him just in case, but the Nav was under warranty still at the time.
They actually replaced the timing chain on the Navara and had the vehicle for about a week, it had the blanking plate in then and no one noticed.
It may come down to the relationship you have with the people there, if you get on well, you may be OK. ????????????