Yolanda Kondonasis also has it on one of her books along with the accompaniment. It’s written for pedal but a friend of mine did perform it on a lever harp.
If you go to http://www.sharonwatsonmusic.com, then click on Solo Pedal Harp Music,. then put Ave Maria into the search box, right away will come up the arrangement by Bach, at $3.95. Sharon is a gifted arranger of harp music based in Indianapolis, Indiana,