Зачем тебе аси лоадер переделывать? Как вариант вот.

GitHub - ThirteenAG/Ultimate-ASI-Loader: The Ultimate ASI Loader is a proxy DLL that loads custom .asi libraries into any game process.

The Ultimate ASI Loader is a proxy DLL that loads custom .asi libraries into any game process. - ThirteenAG/Ultimate-ASI-Loader

github.com