I have to ask, if your goal is "compilable Ruby", then...why not Crystal? (https://crystal-lang.org/ ) Seems like it accomplishes your goals, already exists, and is (as far as I know) stable and well regarded.
Nothing wrong with reinventing the wheel, and you may have very compelling reasons to write your own project. But it looks weird when there's already a well-known project in this space and you don't compare yourself to it. How are you better?