Hunter's Hagbook with no prepared casters

[ShivStabbington]

I'm running Graveclaw, just got through the encounter with Drusilla last night. And something I should definitely have noticed ahead of time, but only realized at the table, is that the Hunter's Hagbook is useless for my party. Our casters consist of a Bard, an Oracle, and a Summoner, all of whom are spontaneous casters, and the Hagbook, as a Grimoire, only functions for prepared casters.

Has anyone else run into this issue? Any advice on how to surreptitiously alter the book's function to be usable by such a party?

[Bryan Stephens]

Could it be a spell extender?

[Reaperzeus]

It isn't a big change to the book itself, so it's definitely still better with prepared casters, but I did convert Web of Intrigue into a ritual spell (which pretty much fixes that spell's issue of having no traditions listed). I then made the Hagbook the only real source for the ritual in writing.