This is personally my feeling of it too. I think the boundaries between us are illusory, and that it is all continuous and fuzzy. So a universal consciousness is no issue for me, one that is neither singular nor separate.
Asking "how is consciousness quantized?" definitely would put you in (4) and is favored by Chalmers I believe. The idea that consciousness can somehow be "aggregated" by sufficiently complex or anti-entropic systems lends itself to this view.
I agree with this. IMO any theory wrt to consciousness has to first and foremost consider that no hard line can be drawn along the continuum from human beings to elephants to ants to yeast cells.
I like that option. You don't have to find something that would give a hard border between "conscious" and "unconscious" entities, nor claim qualia doesn't exist, nor claim a rock has a level of consciousness equivalent to that of humans.
I guess I'm siding with group 4, but just saying that quantity has a quality all its own. Or that universal consciousness doesn't have to be spooky.