I know the point you are struggling to make here, and from the perspective of someone who really does not understand what is meant by Jesus Christ the same "yesterday , today , and forever" there are really better verses for you to use from a misapplied , temporal perspective.
Take for instance the passage where Moses was able to convince God not to do what He said He would do ?
From a perspective lacking in Spiritual discernment this would be an ideal passage to show that God does change.
The meaning of His unchanging nature however is Spiritual.
In that His paramount & never changing purpose in everything else He does is for the victory of the human soul.
It is behind everything else.
And in that vein you would have to do more than scratch the surface Spiritually in Moses's changing God's mind and answer the question :
" Did Moses's convincing God to change His mind ultimately further God's paramount Spiritual purpose of Victory for the human soul" ?
The basis to accomplish God's goal has never changed from what was spoken by God in the garden:
Gen 3:15
And I will put enmity between thee and the woman, and between thy seed and her seed; it shall bruise thy head, and thou shalt bruise his heel.