> pre-existing language agnostic testing framework of 9000 tests

if there exists a language specific test harness, you can ask the LLMs to port it before porting the project itself.

if it doesn't, you can ask the LLM to build one first, for the original project, according to specs.

if there are no specs, you can ask the LLM to write the specs according to the available docs.

if there are no docs, you can ask the LLM to write them.

if all the above sounds ridiculous, I agree. it's also effective - go try it.

(if there is no source, you can attempt to decompile the binaries. this is hard, but LLMs can use ghidra, too. this is probably unreasonable and ineffective today, though.)