I agree with this:
the Kantian dualism is not easily escaped
And indeed, that is why he doesn’t just reject consciousness and the subject/object frame, as Heidegger did.
But otherwise, you’re reading Adorno against his stated position and aims. Instead of arguing the point, I’ll just remind you where Adorno is coming from, with a few quotations.
His goal is stated plainly in the prologue:
Since the author has trusted himself to follow his own intellectual impulses, he felt it to be his task to break through the delusion of constitutive subjectivity by means of the power of the subject […]
Against idealism, the object of intellectual experience in negative dialectics …
… would itself be the antagonistic system, something utterly real, and not just by virtue of its mediation to the cognizing subject which rediscovers itself therein.
The whole movement of the text runs in the opposite direction to the one you’re proposing:
The compulsory constitution of reality which idealism projected into the regions of the subject and Spirit is to be retranslated back out of these.
On non-identity, one of his first formulations is that the object does not vanish into the concept—one object, one concept, not two objects:
Its name says to begin with nothing more than that objects do not vanish into their concept
The contradiction is the non-identical under the aspect of identity
And the aim throughout is the non-conceptual:
The utopia of cognition would be to open up the non-conceptual with concepts, without making it the same as them.
And there is more to come. It’s particularly clear in the “Preponderence of the Object” section, which we’ll be coming to in the next few weeks or months. I’ll quote at length but you don’t have to read it all now—we’ll be covering it soon enough.
The thorough-going critique of identity gropes for the preponderance of the object. Identity-thinking is, even where it claims otherwise, subjectivistic. To revise this, to account for identity as untruth, establishes no equilibrium between subject and object, no hegemony of the functional concept in the cognition: even where it is only infringed upon, the subject is already disempowered. It knows why it feels absolutely threatened by the slightest surplus of the non-identical, according to the measure of its own absoluteness. Even as something minimal it violates the whole, because the whole is its pretension.
In the same section:
Insofar as the construction of the transcendental subjectivity was the magnificently paradoxical and fallible effort to master the object in its antipode, then what positive, idealistic dialectics only proclaimed is to be achieved solely through its critique. It requires an ontological moment, to the extent that ontology critically strips the binding constitutive role from the subject, without however substituting for the subject through the object in a sort of second immediacy. The preponderance of the object is attainable solely by subjective reflection, and that upon the subject. […] This would always already deal with objects. […] If it was argued against this that there would be no cognition concerning the object without the cognizing subject, then no ontological priority of the consciousness follows from this. Every assertion that subjectivity would somehow “be”, already includes an objectivity, which the subject by means of its absolute being would first need to ground. Only because the subject is for its part mediated, hence is not the radical Other of the object, which first legitimates this, does it have the capacity to grasp objectivity at all. Rather than constitutive, the subjective mediation is the block before objectivity; the former does not absorb what is essential to the latter, the existent.
None of this would make any sense if he were “turning this into a totally subjective affair.”