I miss Phabricator from my time at Meta so much, I made this to achieve a Phabricator-like stacked-commit experience via the git cli: https://pypi.org/project/stacksmith/
Do you happen to know how your tool compares to spr? How production-ready is it?
I have been using this for a few months now, and it has served me well! I haven't spent much (any) time marketing it, so haven't really had any feedback from other users yet. Feel free to check it out & lmk if you have any suggestions. It's also open source, so feed free to open issue/PR on Github