Dave of V-Tech Design wrote an article on how to modify a Bus Pirate LCD adapter for the Bus Pirate V4:
Why do this? At the time of this writing Dangerous Prototypes had not developed a new LCD adapter for the Bus Pirate V4 and I needed one for a project. So why not modify the existing V3 model. I unsoldered the existing header from the Bus Pirate LCD Adapter and wired a 10 pin header cable to the LCD Adapter
Get an LCD adapter for $9.