“Monks, suppose a grain of rice or barley was pointing the wrong way. If you press it with a hand or a foot, there’s no way it could injure and produce blood. Why is that? Because the grain is pointing the wrong way. In the same way, a monk whose mind is pointing the wrong way cannot break ignorance, produce true knowledge, and realize Nibbana. Why is that? Because their mind is pointing the wrong way.” (AN 1:41).


On the page meditation teachers there is some description attempting to clear up what Nibbana is. It is also mentioned that the ven. K. Nananande made a series of 30 sermons to attempt to clear up so much confusion about the topic.
For reference I will also add all references from Leighs index to the eightfold practice and nibbana.

What else to add on such strong analysis?

All the analytical approaches can be helpful.
Below there is an attempt at hopefully something more intuitive.

Nibbana as the unconditional
Seeing the suffering of a friend
Wishing for an unconditionally supportive effort
Compassion
Suffusing them
Alleviating their suffering
At the deepest root

Gladness
At seeing their happiness
Not expecting anything in return
One is moved

To strengthen the wish
Absolving self
In the face of such force
There is jhana

It can´t be empathy
Which get´s one entangled
In I-making
Uninterested in any personality view
compassion doesn´t get entangled
it keeps the practitioner
Harmless and secluded

In its heavenly abodes
Not bound to any condition
Imagining it unconditional
Its friends Loving-Kindness, Joy, Equinimity
Close by

Still one notices one can fall away from this
Nibbana without clinging is realized when there is no more possibility of grasping against it
What does it mean to grasp against it?

Sure this unconditional is nice, but…
This grasping at it, also often is an attempt to direct it
Condition it
A quality of it is that it is undirected
If it wasn´t undirected, it wouldn´t be unconditional

A quality of it is that is isn´t about a me or you
If it wasn´t empty of self
It wouldn´t be unconditional

A quality of it is that it is signless
Without proof
Without teritory or map
If it could be captured by what is conditioned
It wouldn´t be unconditional

Seeing how unconditional love
moves towards opening
Itself
Conditions as a disease
Understanding how this arises upon that
How this ceases upon that

Conditions arise dependent upon ignorance
Ignorance dustying up, falling from its opening
Proliferating conditions

Conditions profilerated by ignorance condition consciousness
Conditioned consciousness conditions the mentality-body
The mentality-body conditions the six sense bases
The six sense bases conditions the contact
The contact conditions the experience
Dependent upon ignorance, the experience can be stitched into a consciousness
The stitching conditions the holding on
The holding on conditions the becoming
The becoming conditions the birth of re-action
The birth of re-action conditions the stress

With the ceasing of the stitching
Understanding
holding on
becomes otherwise
there is the ceasing of stress

Ceasing stitching to have, be, destroy
Ceases holding on
Ceases becoming
Ceases birth of re-action
Ceases Stress

Seen rightly, the sense of me was stitched by
Ignorance
a dust, a blight, a getting lost of the unconditional
The five heaps proliferated by dust
The body, experiences, perceptions, intentions, consciousness
As thieves
Conditioning
Consciousness
Into a spiral
further dustying, conditioning, stitching experiences
Into heaps of stitches of experience
Stitched into heaps of consciousness
With the darkness of dusty ignorance at its core

With the ceasing of ignorance
There is the gradual extinguishment of conditions