describe your interests in the position in terms of teaching
This. The academic librarians in my uni do a great deal of bibliographic instruction and outreach. I frequently invite a librarian to give the practitioner view of some module in my class (I'm a prof in a library program). I was surprised at the amount of this kind of public speaking, the amount of classes they teach - a regular class for undergrads and special stuff for grad programs.
I think you need to be open to doing work that may not cover your humanities background. Money is tight. People have to be able to work in a number of environments. Also, look at the library website and see how much (if any) email and chat reference they're doing. How comfortable are you with this method of delivery? Can you get comfortable with it? Also, a student just got a job in another big R1 library system. Hu was asked to design an outreach project, which hu will implement on the job. Libraries are like any other dept of an organization. They have to justify themselves and their budgets - one thing that helps them do this is for other people to see them doing outreach rather than just waiting for folks to show up at the reference desk.
Good luck on your interview.