I am unsure about it being Ching. The touch of silver in the hair probably indicates someone from a different time period. It could be Ching from the future, doubt it could be Clark from the future due to eye color. Very interesting description of the visitor. As Virginia said, obviously Kryptonian due to reaction to Kryptonite.
Interested in how you are going to wrap this up in one more part as there are a lot of loose ends to wrap up (visitor, Luthor, Clark injury, Abrihet) ...
Mike