You can't redefine what free will means and expect people to take you seriously. Free will means you have the ability to choose, and if you agree with me that the universe is deterministic, then you have to admit that making a choice is only an illusion. I can make choices in the same way that a neutron chooses to move toward more massive objects. I eat vanilla ice cream over dirt because I have taste buds that allow me to taste the difference between the two. Eating dirt instead doesn't prove I had a choice, because now I'm not eating dirt for taste, but to win an imaginary argument about free will. It's not the external world I'm reacting to now, but the internal one.

Your scenario is irrelevant because you admit that those processes, which you don't control happening in your brain, are still you. But if they are you, and you don't have control over them, you only become aware of them after the fact, then you JUST ADMITTED you don't have any choice. The choice was already made by something you have no control over, but only watch as a passenger. Your heart beats without your choice. You will pass out and have to breath because your brain will force you to at some point stop holding your breath. You will remove your hand from an external heat source that you did not expect AUTOMATICALLY, and only then become aware that your body moved milliseconds after the stimulus has already short-circuited through your PNS and not your CNS. If you think that the distinction doesn't matter, then you are still willfully lying about the reality, or intentionally want to deceive people about the physical world and how it works by redefining any word you need to to maintain your hallucinated reality.