However, that Brahman is Consciousness itself is integral to both the Vedas and the Upanishads, and is taught by all of the MAJOR schools of Hinduism.
I have referred to Brahman as 'Pure Abstract Intelligence', and 'Sat-cit-ananda', which you rejected. So can you tell me what your concept of Brahman is?
Kindly note that though Vedas and Upanishads are part of Hinduism, they are not the whole of Hinduism. Majority of Hindus may not have heard the names of Vedas and Upanishads. Vedas derive from the Aryan migrants and Upanishads came up mostly after the assimilation of the Aryans into the indigenous people. They are the stuff for philosophers to polemicize. The mass of Hindus happily go about worshiping their multitude of their Gods and Goddesses without caring for the deliberations of philosophers. It is not necessary for a Hindu to belong to some school and many don't. A member of the Hindu forum aptly named them as 'Village Hindus'. 'Brahman' and 'Sat-Chid-Anand' are words coined by philosophers which a 'Village Hindu' would not understand. They would understand 'Ganesha', 'Shiva', 'Yellamma', 'Bahuchara', 'Iravan', 'Dhara Devi', 'Kalu Devta', 'Rama', 'Krishna', 'Durga', 'Chintapurni', 'Naina Devi', etc. The 'Village Hindus' are just as much Hindus as the great philosophers of Hinduism.
Don't ask for my concept of Brahman because it is entirely different from all others. I consider 'Brahman' to be 'physical energy' with which we started at the time of 'big-bang', and all that exists in the universe is constituted by that after atoms were formed through the process of 'Nucleosynthesis'.
"Nucleosynthesis is the process that creates new atomic nuclei from pre-existing nucleons, primarily protons and neutrons.
The first nuclei were formed about three minutes after the Big Bang, through the process called Big Bang nucleosynthesis. Seventeen minutes later the universe had cooled to a point these processes ended, so only the fastest and simplest reactions occurred, leaving our universe containing about 75% hydrogen, 24% helium, and traces of other elements such as lithium and the hydrogen isotope deuterium. The universe still has approximately the same composition today."
Nucleosynthesis - Wikipedia
I appreciate your interest in Hinduism and you do understand some parts of Hinduism, but you do not understand the whole of it.
However, we continue to utilize perception in an attempt to navigate that which is responsible for our existence and that of our environment, when, as you pointed out, even our ordinary perception of our world is sometimes (many times?) inaccurate.
I would replace 'sometimes (many times?)' with 'all the time', 'always in every single instance'. Perception is always an illusion. Only an analytical mind can parse it. That is why Sankara said: 'Brahma satyam, jagan-mithya ..' (Brahman alone is true, the world is untruth ..)'.