I'm about to go to bed so I'm not replying in depth yet, but I just want to ask you a question.

According to QM, if gravity has a quantum particle, a graviton, it wont be a photon.
According to the Standard Model, I believe. Do you believe the graviton exists? GR tells us gravity is merely (lol) warped spacetime. That is, it's not a "thing" like a photon. It's an illusion, like the g-force you get when you accelerate (which I always thought should be called the i-force for inertia, but I digress). Does the g-force have a particle? That sounds ridiculous. So why would gravity? I've never been comfortable with the idea of a graviton.

I'll read your post properly tomorrow after work.