The issue with that is the DC for the spell book mastery is really high, such that I would have to have a 20 to get it, and that takes waywayway too long to do (assuming you could take a 20 on this use)
What level are you? 28 for a book with 3rd-level spells should be doable at level 5...
+8 ranks +2 Synergy +4-5 Int. Another bonus of 3 or 4 and you can take 10. Shape Soulmeld [Mage's Spectacles] can do that, Skill Focus (Spellcraft) is a pre-requisite for some solid PrCs, Craft Wonderous Item can open up the option to craft a +5 competence item and/or a Headband of Intellect +2, and if re-training is allowed then you can even pick up some utterly terrible feats for this exclusive purpose until you have the slots needed to make use of metamagic.
Also, I was wrong about the time, it's 1 week plus an extra day per spell, so it will only save time if you're looking to learn at least 7 spells (or 10 if you live in Faerun), and then it will take a minimum of 2 weeks.
Ok, that's just weird... Given that, how do the rules for mastering spellbooks in CArc work? Does it make the spellbook "your" spellbook, so you can just prepare them normally?
If that's the case, then just wait until you get the required week of downtime and do that. If your spell picks from levels are any good, then there shouldn't be a problem with that.
It takes one week plus one day per spell, and is DC 25 + spell level.
Which is going to be a pain to take 10 on at lower levels.
And remember that wizard spellbooks contain all cantrips, so you've got a time of upwards of 50 days.
Tear out the pages with either cantrips on them or spells you already know and cast Mending on the book itself to replace them with blank pages. Fixes that problem real easy.