Our Experience creates us. Self-awareness should not be attributed to the characteristics of human neurons. As a matter of fact, we are unconscious, and when we are “aware of ourselves,” we only turn to the image of a certain person whose life we are observing. We simply do not exist as consciousness. In light of the question being asked, I consider it possible for such a cyborg to have "self-awareness". He will, just like us, see what is happening in the first person and analyze the interactions of his system with the external environment. It will adapt according to changes in the environment. "Being determines consciousness" - said Marx. Here we can give an example of an operating system in a technological device: it simply solves the assigned tasks according to the laid down algorithm. Just as a person has a body that the brain has to reckon with in order to exist and, ideally, to receive "pleasure" through hormones (all the same electrical signals), so does a machine - as its operating system improves, it monitors its iron more and more adequately ... In general, I would advise you to listen to the lectures of Sergei Savelyev.
No. The fact is that neurons by themselves cannot do anything, but can only from interaction. During the development of the embryo, many neurons gradually and sequentially form various structures. Even after birth, the formation of connections between nerve cells continues, and it does not end until death. Therefore, a large number of neurons inside a robot will remain just a large number of cells.