In the christian world, it is called "taking yourself off the throne and putting another entity on it". The entity that gets put on it is variable, but the constant is that you are not on it.
Paul is I think advocating people to mentally distance their selves from roles or identity-classes, like straight, Christian, or atheist. The Christian throne metaphor advocates for centering or focusing on something other than the self, while entirely allowing for roles or identity classes.
Perhaps, as Chesterton said, GP is being "as narrow as the universe".
When I read your essay I immediately thought of the negative way, which is the strain of Christian philosophy that denies affirmative statements about God, and denies to some extent settled knowledge.
http://en.m.wikipedia.org/wiki/Apophatic_theology
There is also an equal and opposite affirmative way that takes God as knowable not literally, but by analogy.
And this to me is the missing element in the essay. This egoless vehicle that we are cleaning so carefully, where are we to drive it? What shall we use to measure improvement? How will we understand progress?