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Superstar
I really liked the Smallville version of Lex being in the meteor shower losing his hair and the bridge scene where he hit Clark was so awesome.You could make him like Tom strong (an adventure scientist). Only with the personality of Dr doom. The only mention of superman should be the time he went to smallvile and that Moran Clark Kent fukked up his experiment and caused him to lose his hair.
But I could see how losing his hair in an explosion of his experiment and blaming it on something he saw in the fire instead of the fact he was wrong ala Doctor Doom. It would allow them to introduce Clark naturally for ratings.