I saw a photograph of a similar 'hybrid' style of icon from, I think, the Gandhara era, silver, many years ago in a journal. I was interested in finding out more, but never managed to track it down again. I wondered if it might be related to the so-called Jesus Sutras
of the Nestorian Christians, who managed to get as far as Imperial China.
In 1907, explorers discovered a vast treasure trove of ancient scrolls, silk paintings, and artifacts dating from the 5th to 11th centuries A.D. in a long-sealed cave in a remote region of China. Among them, written in Chinese, were scrolls that recounted a history of Jesus' life and teachings in beautiful Taoist concepts and imagery that were unknown in the West. These writings told a story of Christianity that was by turns unique and disturbing, hopeful and uplifting. The best way to describe them is collectively, with a term they themselves use: The Jesus Sutras.
Learn to do good, refrain from evil, purify the mind ~ this is the teaching of the Buddhas