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Productivity of Rust teams at Google
(programming.dev)
Slide with text: “Rust teams at Google are as productive as ones using Go, and more than twice as productive as teams using C++.”
In small print it says the data is collected over 2022 and 2023.
So you're point is that your custom home grown workaround to a failure of C++ doesn't play well with Rusts official solution to the same problem? And therefore Rusts solution isn't better than C++ lack of a solution?
While that is unfortunate for you and you certainly seem to have tech-debted yourself into a particularly nasty corner, I'm not sure that logic follows.
Rust's package manager doesn't manage c++, python, or anything else. Since the real world should not be one language to rule them all any package system must handle all possible languages. Otherwist they are lacking.