I joined lately and bypassed almost all previous comments, don't really know where to start with. But I am inline with your thoughts. One thing is that I don't believe science will help resolve your issue.
Someone from the right beginning of this thread has introduced a Wikipedia article about NDEs that I am sure you have read.
"Neuroscience research suggests that an NDE is a subjective phenomenon resulting from "disturbed bodily multisensory integration" that occurs during life-threatening events." - Wikipedia
Your five points can't stand up with such a research.I don't need to argue about flaws here and there. It appears in your elaboration there is a mix-up between social science and natural science while the two are yet to merge.
For example, "Testimonial evidence" should be replaced by a scientific evidence I believe. At least because it comes from legislative meanings.
https://www.linkedin.com/pulse/differences-between-testimonial-documentary-real-evidence-barbour
Back to the researches that Wikipedia referenced. Under "Afterlife claims and skeptical responses", it's said many prominent researchers supported your ideas but they still need to prove such phenomena can
not be obtained using "conventional means". Now this is a dead end, always to any scientific research about supernatural phenomena, let it be NDEs, UFOs, ...etc.
How can one prove an earthly phenomenon cannot be from another earthly cause? I mean you are grabbing a cat's tail and prove it's not from a cat. Anything - super or trivial - that reflects to us must be via earthly objects, name it air, light, particles and forces ... the challenge is bound to fail right from setup.
In other words, proofs should be considered as unnecessary or even silly to get involved. You don't need proofs to know that you must breath to live, despite extremists would say something like without evidence of suffocation then we'd never know if that is fatal at all.
The point here is when saying about supernatural things, you need something beyond any proofs or pure earthly - your belief and innate sense.
Further, why would one need agreements on super phenomenon? You see yours, I see mine - we rarely agree except for certain shallow, trivial aspects. This belongs to a very profound topic we can talk further if there's enough interests.