Did you notice who killed the firstborns? The Lord (Ex. 12:29). And years later, God Himself put to death His own beloved Son so we might be set free from slavery.
Back away slowly.
It’s worth remembering that even as the early church fathers explicitly focused on the notion of theoprepes, what is fitting for the divine, we do this, too. Everyone puts God in a box. Can God sin? If your answer is no, then you have decided it is not fitting for God to sin. Can we describe God with feminine pronouns? If your answer is no, again you have used theoprepes.
For Origen and his successors, theoprepes was important because it was a significant criticism from the Greek pagans, who largely agreed with Plato’s conception that the soul had sinned and fallen into the body. Therefore, the body was something like a contaminant, and unfitting to house God. The incarnation thus was a major stumbling block, and the early fathers needed to explain why theoprepes allowed for God to take on flesh.
Athanasius of Alexandria followed Origen in this vein with his work On the Incarnation of the Word. In answering the question of the fittingness of the incarnation, he argued it was not only for the liberation of humanity from sin and death, but to restore humanity its dignity. Further, it was not the annulment of creation, but its culmination. The world was renewed by the same Word who created it.