If you knew
Yeah, but I'm working on this. I'm near to have finish the rewriting of the utilities I need for my mods/tools, and half way for the rewriting of the in-game configuration interface. As for the tool itself I don't know. Since I'll need to do tests with real games, it's from "Oops I need to rewrite everything" to "finished".
The test suit I talked about above is precisely for the utilities ; what is half stupid since the test unit is not Python 3.x ready, but at least permit to ensure that once Ren'Py will pass to Python 3.x, any problem will come from the transition, not from my code.
Edit: Oh, by the way, sorry to crunch your dream, but I'm a guy... with a really bad sense of humor when it come to find a pseudonym