This is a new feature you are proposing for PyPI?
Yes.
Can’t you achieve the same result by publishing beta (or alpha or rc) releases? You can also publish to test.pypi.org
I agree, that would also be possible. The motivation for this post was to provide a simpler alternative for the “stage” feature in the draft PEP 694. I had the idea after I finished reading the PEP 694: Upload 2.0 API for Python Package Repositories thread.