py2exe and 3rd party modules deployment

Question

My python app loads other py or pyc files and execute them. I am shipping my app as executable (bundled as single or multiple files - does not matter). I want my app to support adaptive installation. For example: If I ship my app (bundled exe) including ModuleA and ModuleB, and later on, I want the user to install only ModuleC instead of the entire app. I am looking for the following options:

1. If I can ship ModuleA.pyc and ModuleB.pyc separately in the distribution rather than zipped in myApp.exe? I am assuming that user can install ModuleC.pyc by copying it to the same directory of other Modules. And, it will work for a new_script.py (via import ModuleC) which will be executed by myApp.exe.
2. If first is not possible, then what is the other way of shipping ModuleC rather than the whole myApp.exe bundle.

Awesome people, please suggest that how can I do it or is there any better approach of doing it.

Thanks a lot in advance.