A Sabaody level L would be super easy to do lol
Why would an author need balls to do that?
A Sabaody level L is just having Imu show up, beat the Strawhats and their allies, then having Dragon/Shanks/some other strong figure come and bail them out
The only thing he might not do is a significant multi-year long timeskip since it doesn't make sense at this point in the story