I'm not sure how this can scale since it is still not automatic and requires tweaking and maintenance of the bindings; or even if the library has a new update. (As there can be new errors, bugs generated from those bindings)

It still would be painful to maintain and update your Rust project and cargo configs with your C++ code alongside a third party crate maintained by one person in the project. D Lang is probably the only language that has this built into into the language and is done automatically.

I'd still rather go for a first party library with this support or C++ interop support feature built into the language like D with the whole requirement of it being completely automatic.