I suggest looking at the following report that I coauthored, released
in February by RLG Programs, as there are a few potential suggestions
that might help you.

Combs, Michele, Mark A. Matienzo, Merrilee Proffitt, and Lisa Spiro.
2010. Over, Under, Around, and Through: Getting Around Barriers to EAD
Implementation. Report produced by OCLC Research in support of the RLG
Partnership. Published online at:
www.oclc.org/research/publications/library/2010/2010-04.pdf.

Mark A. Matienzo
Digital Archivist, Manuscripts and Archives
Yale University Library