Well, TransCC can translate your CX code to one target language at the translation process. Javascript, Java, C++ or C#. ActionScript is obsolete.
Then its about the build process to bind/build the translated code with various tools like MSVC, MingW, Android Studio or XCode.
Did I understood that correctly, you want to add multiple languages for native code to a project?
The only thing I see where this could be done is in Xcode, where you could mix C++ and Objective C files. But the other platforms, i dunno?
If not, what stops you from doing it?
I have no need for it and I think it is not possible to a a certain extend.
What is the mindset/motivation behind this question?