I don’t like that balance.
For performance-critical things like BLAS and other low-level numerical stuff, C++ is safer than unsafe Rust because standard library and tooling (debug heap, debug allocators, ASAN, etc.) evolved for decades making the language usable despite the unsafety. Another thing, for numerical code you probably need SIMD intrinsics. They were defined by Intel, documentation and other learning resources almost exclusively target C language; C++ got them for free due to compatibility.
For high-level pieces which are not that performance critical, I use C#. Due to VM, it’s safer than Rust. Due to GC and other design choices usability is way better than Rust, e.g. in C# asynchronous I/O is almost trivial with async/await. The runtime is cross-platform, I have shipped production-quality embedded ARM Linux applications built mostly with C#. Unlike Java, it’s easy to consume unmanaged C++ DLLs using C API, or even C++ API: see that library to do that on Linux which doesn’t have COM interop in the runtime https://github.com/Const-me/ComLightInterop