This made alot of sense and resonated with my own models of enlightenment/immortality that I have built from comparing different wisdom traditions and my sober and entheogenic experiences.

I second Jin in saying why do all the work so that your next life can become enlightened?

I am at the 6th stage in my own model, very similar to yours.  I am beginning to have longer and longer periods of thoughtlessness through mindfulness and various sadhanas(spiritual practices).  I have long thought that I will reach the 7th circuit of consciousness in this life but it seems to require different effort [or lack of effort] than it took to reach the 6th circuit. (which was reached for me by experience of GREAT suffering.)

I often think the 7th level is reached by some sort of letting-go or surrender.  Something that seems impossible to the seeker mind that went through so much pain to reach the 6th circuit.  I am beginning to acquiesce more and more to experience and seeming to merge with it.  A sort of "permanent Low-level LSD trip as you said". 

I will look into Robert Burton.  I have studied Fourth Way techniques before. 

Great post you really wrote some BOMBS in there.  Anyone who resonates with them will really appreciate it being put into language. [although it loses something in language, but what other way to share  ]  For others this might sound preachy or WAY OUT THERE.

But thanks again really enjoyed this.