I will make it a scroll, rather than a book and add another jutsu, removing the doujutsu. Or could I just make it a Soaring Soul thing (something along the lines of the shintenshin, just without another body and with the "soul" just soaring about like a bird), or should I think of something completely new?

(Note: I don't read stuff or anything about the series; I only know what I've seen and remember (and my brain is stcky like glue, so I remember a lot), so if I'm wrong about this, terribly sorry.)
Kreig; About the doujutsu manifesting by itself; all the doujutsu we've seen in the anime/manga have been Kekkei Genkai, which cannot be taught, but lie in the blood of the user. If the doujutsu was not part of a Kekkei Genkai, but was just a jutsu that just happened to be called a doujutsu because it had to do with ones sight, it could be taught to just about anyone. That was what I was thinking.