Static binaries are a different story. Go has dependencies as any other modern language and they had a bad story in the past and have a better story today.

Sketch for python: Create a ~/.cache/python/packages directory. Manage all dependencies there. Make the python interpreter "package aware" so that required dependencies are read off a file from the current project (e.g. "py.mod") and adjust "system path" accordingly and transparently. Or something along those lines.

No extra tool, a single location, an easy to explain workflow (add a py.mod file, add deps there with versions, etc).

I'm just thinking out loud, but it does not need to be hard.