Perhaps it may be best to double-check that you have all the knowledge and context that would be required of a shodan before commencing the teaching of others, in order to ensure that you are leading your students along the right path - otherwise, it may be advantageous not to refer to your techings as specifically belonging to "ninjutsu".
Take what you want from what I have to say; I speak with no authority but merely offer an outside perspective.
My teacher is a remnant of a collapsed dojo in a small town, and I am his sole student. So I can on some levels empathise with what you have to say. However, my teacher has been endorsed by his own teacher, who commands a large amount of respect and authority within the Ninjutsu schools of my area. Thus I can ensure that what I am learning is still ninjutsu, and although in physical training there are only two of us, in reality there is so much more in spirit.
If you have not already come across it, please have a look at this site for an example of what you speak of (non-political ninjutsu). It's a pretty common site, as most search engines turn it up rather regularly on any ninjutsu-related search.
http://www.mobilemouse.co.nz/ninjutsu/
Although this teacher is in some obscure little country, he has ensured that he attained the level of (at least) shodan within the Bujinkan and also the Genbukan. Hence his basis of "non-political" ninjutsu is in the sense that he has significant experience at a credible level of both of these major schools (as well as, I have heard, a few other neo schools and the like) but still has attained a suitable level to teach.
Put it this way: if I get a diploma in a given field, I would not feel qualified to teach a stand-alone class on the subject. I would feel competent enough to assist other diploma students in moving towards the same goal as that which I have attained, but none further.
Same with a degree.
A Bachelor's degree and I would consider that enough base knowledge had been accumulated to teach the basics of the subject right up until the level below that of my own.
A Master's degree as above.
A doctorate I would consider being a qualification which merits stand-alone teaching (although a lot of this pertains to the relevant knowledge one gains within the field based on the teachings of the authorities on the relevant subject.)
That's my .02 - take from it what you will, I hope it is helpful to you but if not, perhaps some other reader will find it of use at some level.
