Nirvana is nothing but the peace and freedom of the Spirit which can exist in itself, be there world or no world, world-order or world-disorder.
I myself had my experience of Nirvana and silence in the Brahman, etc. long before there was any knowledge of the overhead spiritual planes...
If the redemption of the soul from the physical vesture be the object, then there is no need of supramentalisation. Spiritual Mukti and Nirvana are sufficient. If the object is to rise to supraphysical planes, then also there is no need of supramentalisation. One can enter into some heaven above by devotion to the Lord of that heaven. But that is no progression. The other worlds are typal worlds, each fixed in its own kind and type and law. Evolution takes place on the earth and therefore the earth is the proper field for progression. The beings of the other worlds do not progress from one world to another. They remain fixed to their own type.
The psychic and the spiritual opening with their experiences and consequences can lead away from life or to a Nirvana; but they are here being considered solely as steps in a transformation of the nature.
In him Nirvana lives and speaks and acts
Impossibly creating a universe.
An eternal zero is his formless self,
His spirit the void impersonal absolute.