@lritter this is effectively what the hg-git plugin is and I have been using it instead of regular git for the last 15 years.
Technically hg-git works by translating git repos into mercurial ones and back, so it's technically not a frontend, but at one time the hg-git maintainer was working on something called hgit that would have been literally mercurial as a pure frontend with the mercurial UI verbs directly operating on git repos
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