You describe things I have seen, but in a completely different context that I can make little sense of.
There are laws in Creation. Since the midwayers were forced to leave after the rebellion of Lucifer - there have been no halfway creatures here.
What you describe may have happened a long time ago - but to my knowledge doe not still happen.
Now it is possible for an Angel to assume Avatar status - to take over the body of a suicide or depressed person, but to my knowledge, if you intend to be born on Earth - it will be the same way for everyone; enroll in the school and you WILL take classes.
The Etheric Body is the template for the Physical. It is the perfect example of who you intend to be in your incarnation, but most people fall out of alignment with it and illness results, due to a fall in vibration. The Ethieric Body is so close to the physical body that the mental body can have an immense influence on it, also causing misalignment and illness if one does not take care.
Each body, from the Etheric outwards, gets larger and larger until a certain vibration is reached and the bodies fall away and the spirit body is the vessel. The spirit body had no form and one can "see" in 360 degrees. If one is able to see the spirit body from the physical, it will appear as a point of light with a radiance (an orb). But there are numerous bodies before one gets to the spirit body if one is going through each one (which is not necessary).
Simply changing vibration and entering another sphere brings the correct body to abide there, it's automatic from what I can tell, and WILL respond to thought commands such as "one level higher" or "the mental sphere". I know those words don't really mean anything but the memory I associate with them - but it works.
I would love to borrow your eyes one day, if this is first hand knowledge here, if that were possible.

I am fascinated by the differences I find with others. I have a good friend who has similar abilities and I am constantly amazed how the very same experience can be interpreted so many ways due to experience.