Rust is a good choice to let LLMs run without a ton of supervision. In my experience you need to monitor the progress heavily and take ownership of the design of the thing you're building or porting. Test harness is a must. Each iteration should run the test and ensure it doesn't break things in other places.

I am in the middle of porting TypeScript to Rust and learned a ton doing this. You can check out the work in progress here https://github.com/mohsen1/tsz/

Happy to share my learnings on this