[nopurpose]

You might find `jj` to help you there: all changesets have stable identifier and their content can be updated at any moment in-place.

TLDR; `jj edit <what_to_edit>; $EDITOR` will update a commit in the middle of the branch

[fleventynine]

Not an option for me until it supports submodules.

[nopurpose]

Prior to `jj` my happiest git discovery was https://github.com/ingydotnet/git-subrepo to replace submodules.