User blog comment:RottenBlock/Theoretical Project: Translation Unifier/@comment-2601:192:C180:1180:7128:E5AA:7C7D:940A-20191115160348/@comment-31720212-20191116204350

That's a clever idea, and while it can only go so far becase translation is never 1:1, it would speed things up!

Assuming you mean .JAF files and not .JAR, you can extract them in bulk using the File -> Decompile Code... menu item.