I am checking with CDG and Air India.You need to check with Air India and CDG. The WestJet customer service agent is likely not familiar with what would happen in Paris.
Just now I called WestJet customer care and they reconfirm me that it's not an issue for them since I have a connecting flight in the next 7 hours from Paris.
So, if WestJet allows me to board the plane, then probably I can manage the terminal transfer at CDG.