I'm going one-up you in craziness, and suggest Chelsea Troy's idea[1] that you don't bother commenting - after checking out the PR locally you just make the changes and then update the PR.

Sure, there's still discussion when needed, but otherwise take it as a collaborative effort where you're asynchronously pair-programming.

[1] https://chelseatroy.com/2019/12/18/reviewing-pull-requests/