You want to run the video of the PC into... Another PC?
If I understand correctly, you want to know if there's an adapter cable to allow connecting the Kenwood unit directly to a PC....
Yes. You can use a video device with TV-out or a scan converter to get composite video signal to the Kenwood unit (assuming it has composite in).
You will not, however, have use of the touchscreen for the PC. That's why the guy hacked the unit, so he could use that functionality on the PC.