Thanks for this really nice rendering of physicalism and its “trilemma!”
Although I can’t tell you about the intrinsic nature of non-physical consciousness, I do have a detailed idea about its workings and interaction with our brain. From your writings, I think you’ll appreciate it since its abstract components can actually be described. You’ll find a short, dense summary of the idea under my name here in Medium—the one about quantized space. If you like, I can send a more detailed, friendly description.
Also, I’d be interested to know if you have a favorite argument for abstraction as an immaterial reality. You may contact me through my website if you like, garyblaise.com