How to make more than 200 monograph titles available OA annually on a small-ish budget

When it comes to library budgets, how far can £10,000 stretch? Access to a small database, a couple of journals, a handful of article processing charges (APCs), maybe one OA book via a book processing charge (BPC)? That figure might also support scholar-led and small university presses to publish more than 200 front-list monographs annually on an immediate open access (OA) basis. Sound interesting? Jisc has been supporting a number of OA monograph community agreements, which operate on a few different models, but all with the aim of raising sufficient income to allow the publication of new monograph content without needing to charge the author a BPC.