Run a two-particle, single-spatial dimension, time dependent sim of the Schroedinger equation, starting with a high level of quantum independence, and you will see decoherence as plain as day.

Please feel free to post a link to such a sim. I'm almost willing to bet real money against it. That you would even propose that decoherence can be observed without including the environment in the simulation tells me how much of QM you really understand.

The Collapse postulate breaks CPT symmetry, violates conservation the quantum hamiltonian, violates Liouvilles theorem, violates relativistic locality, is non-linear, is non-unitary, is non-differentiable, inherently stochastic, poorly defined, anthropocentric and formulated in deep confusion.

You mean, the straw collapse EY constructed and happily demolished. The windmill you are fighting has nothing to do with the orthodox formulation of QM, which is perfectly compatible with decoherence.