There is no "system at large" that does anything relevant to my dinner order. The universe does not act as a system. It contains many systems, such as our solar system, which contains our earth, and its biosystem, which in turn contains us, each of us with our own central nervous system. And each of these systems behave separately and deterministically.
Why do you repeat this even after I have described the distinction? Must I repeat it again?
There are many elements at work, your own circumstances, nation, city, town, culture, the restaurants in your area, your dining preferences, your wife's preferences, compromises, time frame to dine, where you sit, what is available on the menu in relation to your and your partners proclivities, etc, etc, etc, that is referred to as 'the system at large.
And yet none of those factors chose from the menu what I would order for dinner. I made that choice myself.
There is far more at work than just you. Nor do you as a conscious entity have access to or control of the means of your own experience.....which is not a matter or will, yet alone free will.
"I" happen to include all of my goals and reasons, all of my genetic proclivities and prior life experiences, all of my beliefs and values, my own brain and its decision making functions. All of that stuff is "me".
All of these are beyond the scope of will or conscious regulation. You are what your circumstances produced, genes, environment, society, culture, determining how you think and your immediate circumstances, what you think, decide and do.
You're spinning a paradox by inserting the very dualism that you denounced earlier! It is not necessary for me to consciously regulate my individual neurons. I AM those neurons as they read the menu, consider the options, and choose to order the Salad instead of the Steak. Whatever they decide, I have decided.
There are only two objects involved in my choosing what I will have for dinner: the menu and me. All of the prior causes of this event have resolved into one of these two objects. For example:
We can, in theory, trace the causal history of the menu, back through the building of the restaurant, the desires of its founders to operate a restaurant, their choices as to which meals to offer to the public, etc., and all the prior causes of those prior causes.
We can, also in theory, trace the causal history of me, from the time I was born, and all of the influences that shaped me into who and what I was at the time that I decided to have dinner at the restaurant, and what I chose for dinner.
But none of those prior causes of me are able to participate in the choosing operation without first becoming a part of who and what I am today, at the time of my choosing.
Thus, all of the things that you list are resolved into two physical objects: the menu and me. And it will be me that chooses from the menu what I will have for dinner tonight.
The waiter, taking note of this obvious fact, will bring the dinner I ordered to me, and not to any of my prior causes. And he will also bring me the bill for my dinner, holding me responsible for my deliberate action.
Oh, and, of course, we could also, in theory, trace the causal history of the waiter, how it was causally necessary from any prior point in time that he would be the one taking my order in the restaurant.
But, what are we going to do now with all three of these causal histories: of the menu, of me, and of the waiter? Why, dump them in the trash, of course! Because they are useless.
You see, deterministic causal necessity doesn't actually change anything. It is still a simple matter of me, choosing for myself what I will order for dinner, and responsibly paying the bill on the way out.