Philippians 2:6-11 explicitly describes Christ as existing in the morphē of God, a phrase that emphasizes His preexistent divine nature,
Yep. That is why Philo called Logos, God and creator and image of God and High Priest and Son and Light and eyes of God etc.
This is not the language of an emanation or a subordinate being but of one who shares fully in the divine essence.
An emanation is by definition a sharer in divine essence.
Philo's Logos functions more as an intermediary or instrument of creation, not as a fully animate being or a divine person in the Trinitarian sense.
You have repeated that line many times now. I agree. Of course, Philo did not have any Trinity doctrine in mind, neither did Paul et al. What I have said in reply is the transition from anthropomorphized emanation to being is already in evidence in Pre-Christian works and Philo. It is my position that the earliest Christians themselves walked that line. Christ was a revelation drawn from OT texts seen through the lens of Hellenized Judaism. He was believed as real as the God he came from. But it was the later generation stories that followed that really cemented the image of a guy walking around Palestine. Did the writer of Mark intend that, I personally don't think so. I believe it was a dramatization of a Christian message of separation from Judaism. Others followed suit, expanding this persona with additional logia (as Hart put it), more fully fleshing out the character.