Distributing revisions to patches in a series

I was wondering if anybody's got a good process for the following situation: I've just rebased a series onto the new origin/next. In the afterwards, I determined that some of the intermediate merges weren't right (the patch to split bundle-handling out of builtin-bundle didn't pick up fixes to builtin-bundle). I also found and fixed a warning added by my series. I want to take these changes, split them into individual hunks, and apply each hunk to the appropriate commit from the series before that commit, generating a new series.

I know how to do it by figuring out where the hunk should go myself and branching, fixing, and rebasing, but I was wondering if there was a magic script to just do it. It seems like it should be an automatable operation (take the last commit as a set of hunks, and walk back up the history, leaving each one at the oldest commit to which it applies cleanly; when all of the hunks are allocated, generate a new history by amending commits).

	-Daniel
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