This is the right place for Ren'Py help. Please ask one question per thread, use a descriptive subject like 'NotFound error in option.rpy' , and include all the relevant information - especially any relevant code and traceback messages. Use the code tag to format scripts.
I tried a little bit more this way and finish to gave up in front of other errors.
So at the end i choose you to use your first method because i find it more simple and understoodable for my level of knowledge.
You can see how I manage to do it here :
Thank you again anyway.