To play devils advocate on the Mira payment argument, when we last spoke to her she said she couldn't give us access to more resources because was too busy trying to maintain her control over the order.
With Alric denied of his glory, that job becomes a lot easier for Mira, and in theory she should have enough freedom to release more resources for our literally world saving project, so I don't really see much wrong with informing her of this change in circumstances, and then reminding her that she still has an opportunity to contribute further to the project and wow that sounds really underhanded now that I say it out loud.
As for the spell book, well, as has been pointing out, we're spending an AP to learn cloak activity and we get two other spells for free. And cloak activity is a very useful spell indeed.