Rust is certainly an attractive option, but the support for MCUs used in automotive seems weak (because the variety of LLVM backends is less than that of gcc). What do you think about this? Will you use a GCC-based Rust compiler (e.g. gccrs or rustc_codegen_gcc) or your own LLVM backend?
While systemd-timesyncd contains a workaround for this, chrony does not seem to.