at the cost of months of onboarding time. It's an awful syntax that is very difficult to understand.

Unnecessary with a GC.

Rust might be almost ok to write embedded stuff with but I think on such small code bases C and Assembler are a better option anyway.

Rust is a solution for a problem that doesn't exist, and was funded by a company that clearly is in the pockets of the big cloud providers, and probably intels as well. I don't trust tor either, btw. I'm not green to this stuff, you can find me in the first year of the Tor mailing list.