Peter A Goldsbury
I think you will find that Prof Stevens has pretty well cornered the market. Apart from translations made by Stan Pranin for Aiki News / Aikido Journal, and the Bieris for the bilingual edition of Budo Renshu, there is nothing else (in English, that is: there might well be translations in French and German).
Thanks much. <Scurries off to hunt up sources.>