You might consider a Master's in Library/Information Science. There are many master's students at the top MLS schools who have 4 years of college Latin and Greek, some with a MA in Classics, who want to work with the preservation of those rare books that deal in those languages. Some big universities, Yale and Duke in particular, have phenomenal classics libraries that need librarians with extensive knowledge of the classics. The top Library Schools are UNC, UCLA, U-Texas, U-Michigan, U-Illinois Urbana Champagne, Pittsburgh, U-Washington Seattle. You can look that up in the latest College News bulletin (though oddly enough classics ratings aren't in there at all).
Something to think about.