I have had some success with asking the LLM to rewrite the commit history after the feature was written. I often have a good idea of a good conceptual split, and the LLM has no problem doing the soul-crushing work of manually pulling out individual files or hunks into a sequence of commits and making sure each builds.

I need to do this before I can even review the code myself, and I review everything before I send it to my colleagues for their review.