Having been looking for this myself for the last little while I can pretty much say there is no school in the area that will give you what you want. I drive to Toronto now to get that for myself until I am able to aquire enough skill to set up a group for the art I am doing now here.
Many of the people who teach kenpo in the area, be it american or otherwise, also have a second art they teach within their school. The ones that are in an association are not there because of the art per say but more for the financial aspects. But that's my opinion.
You will not find schools who trained like they used to "back in the day." Only people who do. Jaybacca is one, which is why I train with him. The chances of finding a school like the one you seek is slim. I am in the midst of investigating one but I know for a fact there is NO strong association ties with it.
Why is there no strong Kenpo schools? Maybe the people now teaching it just were not there back in the day. The second art in the school is ok, but not at the expense of the primary art. But perhaps it is there to add depth because it is lacking. Those that were there back in the day quit due to the people running these schools became egocentric or just went on their own.
Perhaps if you decide to form a regular workout club with friends and like minded people and align yourself with a group that might help.
Jaybacca's older brother is one bad mofo and if I wasn't in fear he'd freaking work me to death or kill me I'd ask him to start some kind of workout class just drilling basics. Seriously, he's old school all right. The kind of instructor that puts the fear of whatever God you ascribe to into the student.