So you gain a small number of spells per day, but otherwise you have an entire spellbook of reusable scrolls. That seems pretty nice, it's kind of like a wizard who leaves over half his spell slots open. It would indeed be useful to have a constantly recharging scroll of remove disease or remove paralysis or break enchantment.

Seems pretty nice, though I don't know why you decided to give the spellbook a fancy name and a big introduction. If you don't get to choose what your Arcane Focus is, why not just call it a spellbook?