In my recent campaign, I just say any HP under half-Constitution is stress, which allows me to have NPCs attack PCs with words, and vice versa. 5e makes that really easy to do. It also means no one can ever die through words, but they can get stressed out. And it adds a new spin to fighting anyone who can talk to you. It also replicates the way fictional fights happen, where the villain always tries to convince the hero about something. And it works well for a punk game.