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As I wrote somewhere before, you have to see two kinds of things between Kihon and Henka. They are (1)common things and (2)different things.

You can learn (1) throuth other things like Taijitsu, Tessenjutsu etc., but where do you learn (2), namely Tanto-proper things?

In this case, you have to know how the things have to change when you try a Henka with a Tanto from Taijutsu etc. That's what we have to learn through Tanto Kata, isn't it?

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Actually we call it kogusoku rather then a tanto or tantojutsu in Takenouchi Ryu. The kogusoku or yoroi doshi can vary in lengths but is it longer then a tanto and shorter then a wakizashi, the one I use is 45cm. Though the kata will work with just about any size blade from a tanto to a wakizashi to even a full length sword. In Takenouchi Ryu we have around 135 maybe 138 kata in this area.
Just recently I was watching the Takagi Yoshin Ryu video from Hatsumi Sensei and I could not help but notice how many of the kata there resemble Takenouchi Ryu kogusoku just minus the blade. It is not hard to make these interchangeable. The 2nd head of Takagi Yoshin Ryu became a student of the 3rd head of Takenouchi Ryu after they dueled and Takagi Umanosuke was defeated. Recounted here: http://www.furyu.com/archives/issue10/Hisayoshi.html