I recently stopped breastfeedng my baby - less than a month ago. The pull of the NB does not simulate breast feeding at all. Now, that is just my opinion and my experience. I can still express milk but when I pump with the NB no milk comes out. It most certainly does not stimulate milk production in my case. a baby's suck is very particular, which is why breast milk pumps are very different to the noogleberry. That's not to say if you pumped with full breasts it wouldn't make them squirt because, as I'm sure you know, even a brush of the arm against your breast when they are full of milk can make them leak so exerting pressure on them in the domes would definitely. Like you say, if yo were to pump, with empty breasts it is unlikely anything would come out.
However, as you are currently feeding I would be more concerned about glands inside you breast that may be enlarged and how they would be affected by the pressure of the noogleberry. We want to increase breast tissue not anything else that may be currently swollen due to breastfeeding, think about all the ducts and the breast sinus (where the milk collects). You would not want to damage them in case they affected your current breastfeeding, or any breastfeeding you may wish to do in the future. I have stopped feeding my little one and am not having anymore children therefore I am not too worried about these things but as you are currently still feeding it may be something you want to consider.