The Little Office varies according to the part of the year, but as most of the Little Office is taken from the Common of BVM and a few Marian feasts, you should be able to find accompaniments for all or most parts in the Nova Organi Harmonia and other organ accompaniments for Vespers.
Igneus is correct -- I happen to have the Bas accompaniments in front of me and can construct the necessary collection of chants from it easily. I can scan it in if necessary but the corresponding NOH versions would probably be smoother if available.
To participate in the discussions on Catholic church music, sign in or register as a forum member, The forum is a project of the Church Music Association of America.