I don't know the answer. But a robotic voice is probably not a bad idea — just having a reminder that the thing you're talking to is not actually anything like you. If you want to go full send, you could have the LLM generate a clickable interface on demand so you could interact with it as a machine. Voice/computer interfaces are obviously useful, especially for disabled folks. But the ones that existed in the past didn't pretend to laugh at your non jokes or imitate vocal fry.