Thanks to a recent comment, we have become aware of Emilda, another open-source library software system. This one appears to be further along in terms of features but has a smaller development community. It also is not mature on Windows IIS, so it appears that we will have to install a Linux server if we want to try either Koha or Emilda, or both.
Richard Kassissieh is Assistant Head of School for Academics and Strategic Initiatives at
Emilda is a bit more of a pain to install because of Yaz and Zebra but wasn’t too bad.
Best of luck with the search!