It doesn't seem like it, but this is dangerously close to the frequent request: "How do I make my voice sound like something or somebody else?" This is usually in the context of "make me sound like a professional announcer," but it can also be a way to simulate a game effect or sound. "Make me sound like a Mega Zorroid Master in my favorite game."
Oddly, this isn't all that hard to do backwards. Effect > Vocoder can give you the Talking Guitar effect, where the pitch comes from the guitar but the intelligence comes from the actor.
You may get close by choosing good values of Effect > Low Pass Filter. Most intelligence happens in the 1000 to 3000 frequency range. This is the "telephone" effect and that's why those frequencies were picked. They 're the minimum needed to make out what the person at the other end is saying.
So try values of 1000, 2000 and 3000 in Low Pass Filter and see if any of those results will work for you.