In thinking more about your method and how it came about, I am sure when a seasoned player was voicing a riff to a colleague or student by scat or something similar, in addition to the words (scat) spoken, the words had a certain pitch, articulation and rhythm that would get engrained and taken away by the student. One would not be able to totally get it just from seeing the written words spoken in that encounter esp if jazz.
You have already done the hard work in writing the book and coming up with the phrases with words. All that would be needed now to make it even more effective would be to basicly record for the students your singing of the phrases in the book how you think the phrases should sound like and be played by the student.
Don't mean to repeat oneself here. You definitely have created something potentially very helpful to students and are to be applauded for this. This proposed added step could be thought of as the nice frosting on the beautiful cake. Thank you.