Your question is not about Jesus ability to sin, but about his conscious knowledge: Was Jesus aware that he could not sin? Your answer, Yes, he knows that he could not sin, does not actually address the question. The question was not whether Jesus knew that he could not sin, but whether he was aware that he could not sin.
When coming at the atonement from a perspective of eternal conscious torment, how do you understand the reasoning behind the necessity of Christ's death as a payment, and why the damned's payment seems so different from what Christ did?