When I read through your example, Class::Accessor immediately came to mind, so I'm not sure what benefit a source filtering approach brings to this problem. There doesn't seem to be much documentation for Module::Compile::TT, so how else can be used e.g. can you use it to simulate macros?
I needed tt for a set of methods that operate on two different classes in almost the same way. It's still just boilerplate code (the object that needed this code gen was a factory object with some convenience routines).