If you have no credible source for this idea, then why do you mention it? It is impossible to prove that the first iconographers to use halo didn't take inpirations from pagan imaginery.
In order to know if halo is compatible with christian faith, you have to look what is the meaning of light in Scriptures. You can see from many fragments (like The Gospel According to St Jonh the Theologian Prologue) that the light means the life-giving energy of God. We can see that Christ shone with light during His transfigurations. We see prophets seeing light during their revelations. This is why Christ is surrounded by halo in icons (in the icon of Transfiguration this halo is big and surrounds His whole body).
Also the holy men (I don't know why you use quotes here) could be seen shining this light. There is a wonderful example in this text: http://orthodoxinfo.com/praxis/wonderful.aspx
Father Seraphim replied: "I have already told you, your Godliness, that it is very simple and I have related in detail how people come to be in the Spirit of God and how we can recognize His presence in us. So what do you want, my son?"
"I want to understand it well," I said.
Then Father Seraphim took me very firmly by the shoulders and said: "We are both in the Spirit of God now, my son. Why don't you look at me?"
I replied: "I cannot look, Father, because your eyes are flashing like lightning. Your face has become brighter than the sun, and my eyes ache with pain."
Father Seraphim said: "Don't be alarmed, your Godliness! Now you yourself have become as bright as I am. You are now in the fullness of the Spirit of God yourself; otherwise you would not be able to see me as I am."
(i recommend to read the whole text)
So even if there was some pagan inspiration in this symbol (like e.g. clergy vestments taking inspiration from the roman officials dresses), it is now used for the christian meaning and is fully compatible with what Christianity teaches.