Psy-K: "And yet there seems a rather compelling argument in favor of the idea that _somehow_ it arises from physical processes, and not in a removable property-dualism/epiphenominalism way."

Probably, I guess.

Maybe it's chemical, as Penrose suggests, which would fit in to your constraints. For the purposes of considering the ethics of strong AI, even if I accept your "seemingly compelling argument" it's not obviously algorithmic.

I simply say it's an undecidable proposition, though.

Which doesn't make me an epiphenomenalist but an epiphenom-agnostic. It still leaves me as a diehard dualist. I cannot imagine even a reduction of consciousness to physics that is even coherent, never mind correct.

I see a lot of handwaving but nothing resembling a testable hypothesis anywhere. Surprise me and show me some science.

I don't see why the burden of proof should be on me. You guys are the ones who want to plug this damned thing in and see what it does. I want to see more than wild guesses and vague gestures mimicking "emergent processes" before I think that is anything but a very bad idea.