Hi Paulus
I wrote a long reply to your interesting post, then read it and thought "this is nonsense" (my post, not yours). Instead I will post a brief attempt to summarize my position. It probably makes no sense either, but at least it's quicker to read.
It's been a while since I realized I must have existed before I was born, that in fact I have existed forever in the past. I don't recall the exact steps in my reasoning, I could probably retrace it if I wanted.; in any case I have since accept that as a truism, and observed that it explains quite a lot of things for me.
One thing that became clear for me is that, at my essence, I am not a thing, an object; I am only an idea, or rather a collection of ideas. It is only ideas that can exist forever, and it's only ideas (abstractions) that can exist in the absence of a physical universe. So I just made the jump from the unbelievable notion that atoms can be conscious to the unbelievable notion that ideas can be conscious. Somehow the jump looks reasonable to me, solely on the basis of its explanatory power.
Now if I am a collection of ideas, what makes "I" "me", or rather why is it that I am this collection of ideas and not that other collection, I believe the only possible answer is: mere chance. You can only develop your identity as a result of mere chance. This is where the perfect sphere analogy comes in.
If someone asks you to select a collection of points on the surface of a perfect sphere, the first point can only be chosen at random. The second point must be chosen based on the first, but other than that, it's still a random choice, with the sole exception that it cannot be the position defined by the first point (even with two points, you can't still tell one from the other - they still don't have identity). Only when the third point is chosen is the symmetry of the situation broken, and now all points have their own identity which is their relative position to the other two.
So the first being who became conscious had no problem understanding "why am I me", since he could not be anybody else, for there was nobody else to be. The second being could conceive of being the first one, but would realize being the other and being himself are essentially the same thing, so the question "why am I me" was meaningless for him. Only from the third being on did the question of one's identity become meaningful, but it is still a meaningful question without a meaningful answer other than "mere chance". Which is why I said this was known since the beginning but at the same time it's an eternal mystery.
That should, I hope, make it clear to you how my perfect sphere is not your "one"; my sphere was just a metaphor to convey an abstract notion, your "one" not only is real but probably the most real thing around, if not the only.
So, back to the drawing board?