If there are no Byzantine copies that contain this varient reading, then you do not have the warrant to use such a reading.
Final response.
I believe in the providential preservation of the Word; you believe in the providential preservation of MSS. The Word is without error from beginning to end. That is the kind of preservation I believe in. Your Byzantine mss. contain numerous different readings from one another. This leaves you with the providential preservation of variant readings. I could never hold your theory in good faith. I am assured the Lord will continue to guide you in your study of this subject because I know you are of the truth.
Blessings!