30' head w/o attached line would be tough to use and useless...may want to at least granny knot the head to the tip top, if your not going to attach it to a running line...in the strickest definition of head use of course.
you must be talking about some sort of new spey-tenkara setup, I think you're on to something. Easy mends, no tangles, reel to worry about. The only downside is that you can't shoot any line, although shouldn't matter much since few of us can cast more than 20-30 feet anyways.
Anyway, quit helping this poor guy. You have so far passed along more misinformation and confusion than anything. Now you have poor Jordan side tracked on tenkara... Not trying to be a jerk, just figured tact would be misunderstood and the point lost.