Peter A Goldsbury
It is very good that you are translating this lecture. Have you come across a book published in 2008 by Serge Mol? The title is Invisible Armor: An Introduction to the Esoteric Dimension of Japan's Classical Warrior Arts and he deals with many of the Mikkyou concepts discussed by Tada Shihan.
I've seen it, but I've never read it. Do you recommend it? I don't know much about Serge Mol except what I read here