Hi guys,
I am happy to see you have made progress on this. I have been keeping my eye on this since seeing the Failoverflow blog posts a year ago. I was going to purchase a unit and get this working, but I have been busy and couldn't justify the cost. Since you guys basically figured it out, I think I can help.
I was the first to root the Kenwood DNN990 Excelon unit and learned a lot of "tricks" about getting ADB going and the like.
Sounds like the next step is just to get a WiFi dongle with drivers working and then enable ADB over TCP?
Last time I looked at a Pioneer update