The only reason to think he can succeed is that he has to hit a low target to be valuable. If he can hit .230 against righties and .280 against lefties, then he can have a multi-year career. His career against lefties I think is in that neighborhood.
Yes, something like a .300/.350 OBP/SLG against righties would make him at least playable - probably make him like .320/.380 overall?. Last year it was .240/.290
You can't put .240/.290 in your lineup, that's like having a second pitcher, almost.