Rolling Elbow's right, you will at least need to familiarize yourself with taijutsu basics, but I know that you are seriously into Judo. I think you might be surprised how much Judo is like taijutsu, after all, they're both just jujutsu when you get down to it. Think of it as Judo with a heavy emphasis on the Tenshin Shinryo atemi stuff. I'm not out recruiting for the Genbukan, but Tanemura sensei does have a system called Goshin-jutsu (self defense techniques). It focuses on the easiest and most effective techniques from jujutsu, ninpo, and Chinese MA, and it's popular with cops, security people, etc. Good Luck!