I think the problem is not in translating, but in describing something that cannot be described verbally to start with. Why physicist and engineers need to resort to mathematics, because language is deficient fore their purposes. You could describe aikido anatomically, this muscle contracts at time x for period y and that muscle relaxes at time q for period w. This still would not explain what happens. Probably why O-sensei said that oral instruction, the teacher instructing the student one to one is necessary. Some things cannot be transmitted by words alone. Even this oral instruction is limited if the students body is not responsive in the same as the teachers.O-Sensei's unique body conditioning resulted on something which he could not verbalize. probably also why you have to watch closely and steal the techniques. You might have to develop a language to express the problem, as mathematics describes physics, before you can begin to translate.
Well, there is a language, at least 1,000 years old in Japan, and older than that in China, that was formulated specifically to describe and explain these ideas. Morihei Ueshiba used that language - the spirals and six directions are just one very basic example. More will be forthcoming.