I think this will bring us closer to advaita Vedanta which said that pure eternal consciousness do exist
This quote from mahasi sayadaw is similar to your view
Manual of insight page 464-466
Where water, earth, fire, and air do not gain a footing:
It is from here, that the streams [of phenomena] turn back,
Here that the round [of the defilements, kamma, and its
result] no longer revolves.
There, name-and-form ceases.
Where consciousness is signless, boundless, all-luminous,
That’s where earth, water, fire, and air find no footing,
There both long and short, small and great, fair and foul—
There “name-and-form” [mental and physical phenomena] are
wholly destroyed.
With the cessation of consciousness this is all destroyed.The statement that nibbāna is “all-luminous” in this passage means that
it is completely cleansed of all defilements. Similar metaphors are used in
such expressions as “the light of wisdom” (paññā-āloka), “the luster of wis-
dom” (paññā-obhāsa), and “the torch of wisdom” (paññāpajjota). It is in
this same sense that the Buddha said, “Bhikkhus, the mind is luminous.”
The sense here is that nibbāna is always luminous. The mind and wisdom,
which possess an innate luminosity, can be soiled by defiling phenomena.
Nibbāna, however, which is the cessation of defilements or conditioned
phenomena, can never be connected with defiling phenomena. Therefore
there is no way that any of these phenomena can soil or defile nibbāna,
just as the sky can never be painted. As a result it is said that “nibbāna is
all-luminous.” To be straightforward, the meaning of the commentary and
subcommentary is only that nibbāna is absolutely not connected to the
defilements, or is completely cleansed of them.
So one should not misinterpret this statement to mean that nibbāna is
literally shining like the sun, moon, or stars, and that one sees this lumi-
nosity by means of path knowledge and fruition knowledge. This kind ofinterpretation would negate previous statement that nibbāna is signless,
would be inconsistent with its unique “signless” manifestation (animitta-
paccupaṭṭhāna), and would contradict Venerable Nāgasena’s answer to
King Milinda’s question about the nature of nibbāna. In fact this kind
of literal interpretation would be in opposition to all the Pāḷi texts and
commentaries that say that there is no materiality in nibbāna. In any event
the cessation of potential defilements and aggregates is not something
that is luminous and bright. If it were, the Pāḷi texts and commentaries
could easily have said that “nibbāna is luminous and bright.” Otherwise
they would not explain it with difficult names such as “destruction of lust”
(rāgakkhayo), “the peaceful ending of all conditioned phenomena” (sab-
basaṅkhārasamatho), “nonarising” (anuppādo), and so on, which are taken
to be opposites of conditioned phenomena. One should reflect deeply
about this!That’s where earth, water, fire, and air find no footing,
There both long and short, small and great, fair and foul—
There “name-and-form” [mental and physical phenomena] are
wholly destroyed.
With the cessation of consciousness this is all destroyed.These lines point out nibbāna, or cessation. The last line points out the
cause of this cessation. “Consciousness” here refers to both the death con-
sciousness (cuticitta) and the volitional mind (abhisaṅkhāraviññāṇa) at
the time of parinibbāna. All presently existing conditioned phenomena
come to an end due to the destruction of death consciousness at the time
of parinibbāna, and because there is no volitional mind that can produce
results, new phenomena do not arise but cease to exist. Thus, with the ces-
sation of these two kinds of consciousness, all conditioned phenomena
cease. This is like the cessation of the emission of light from an oil lamp
whose oil and wick have been completely consumed.
In summary:Nissesa saṅkhāra vivekalakkhaṇaṃ
sabhala saṅkhata vidhura sabhāvaṃ
nibbāna metaṃ sugatana desitaṃ
jhāneyya saṅkhāranirodha
mattakaṃ.The Buddha described nibbāna as having the characteristic
of being secluded from conditioned phenomena and as being
their complete opposite. To the wise, nibbāna is simply known
as the utter cessation of conditioned phenomena.