This is a classic example of just how desperate you are to manufacture evidence.Shepherd, Rod and Staff refer to The Second Person of The Trinity, in Psalm 23.
In a way, it's understandable .... you've ONLY got inferences .. and not one single clear, simple and direct statement of your theory, while the Scripture is unanimously unitarian.
1 Tim 2:5 For there is one God and one mediator between God and men, the man Christ Jesus,
1 Cor 8:5-6 For even if there are so-called gods, whether in heaven or on earth (as indeed there are many "gods" and many "lords"),
6 yet for us there is but one God, the Father, from whom all things came and for whom we live; and there is but one Lord, Jesus Christ, through whom all things came and through whom we live.
John 17:3 Now this is eternal life: that they may know You, the only true God, and Jesus Christ, whom You have sent.