Do you need one that is flatter or just shorter? WFO concepts, PSC and Parts Mike (probably others) all sell a flat pitman that isn't drilled so you can make it from 5-7". There is another place that has one you can probably drill shorter than that but the name is escaping me right now.
The Waggy arm is flat but is longer than stock. It will also clock differently on the steering box so you'll have more turns one way and few the other. But does make a good longer pitman arm.
Heating the stocker and pressing it flat can also work depending on what you are after.