I used the code of the 'user' module to try, and it works, unfortunately I wanted to prompt the user for the args and the custom module can't seem to do an interactive session.
The var_prompt module is not really suitable, for what I see. I have to get 4 answers and a lot of work to validate them in between, that's why I think it's best to do that in Python, then pass to Ansible the arguments to use in the deployment and fire it off. Looks like I'll have to use --extra_vars to pass the args to Ansible. Pity, a custom module sounded neat.
Thanks