I solved this in 2019 with PyFlow, but no one used it, so I lost interest. It's an OSS tool written in rust that automatically and transparently manages python versions and venvs. You just setup a `pyproject.toml`, run `pyflow main.py` etc, and it just works. Installs and locks dependencies like Cargo, installs and runs the correct Python version for the project etc.

At the time, Poetry and Pipenv were the popular tools, but I found they were not sufficient; they did a good job abstracting dependencies, but not venvs and Python version.