on embedded rust is still much larger than c because rust links its stdlib statically.

There is such a thing as no-stdlib Rust deployments.

which is for MCUs only and is like a bare metal language without any libraries, its use is very limited.

all I need is that rust's stdlib can be linked dynamically just like c/c++/java/whatever, if that happens I'm ready to switch to it.

It seems like you have multiple binaries (otherwise, I don't see how you would save space) in a context without an operating system, but do have abstractions like a linker; throwing this out there, you may be able to sort of fake having dynamically linked binaries with transparent disk compression. The shared code gets compressed, and you trade the overhead of your linker for the overhead of your compression, and probably roughly break even.

nope,not even close,the final size of a few binaries is at least 10x larger