Backup Grimoire? Like a mini-grimoire in the inside suit pocket ...what would it take to get people to want to use this, though? Would it be enough to eventually introduce new spells later in the game, so you would end up with a second grimoire as full as the first one - or would it work better to always offer at least one similar but specialized cast every time you gain a new spell? From the beginning of the game. Or would it work to encourage people to create one "green" grimoire and a "black" one, for example. Would it work to have this as a quest? That it's part of wizard lore to craft your own book?
Because a bit of the problem with having too many spells is that you might tend to choose a selection of the spells you have in the grimoire. And then rotate with other spells in that grimoire, while ignoring spells you don't have or can't get into that first grimoire. Or, that you end up with two spellbooks with an equally random selection of spells..
So I'm wondering if there's a more intuitive way to get around this.
I think you misunderstood the joke (whether or not it was funny is left as an exercise for the reader). He meant "I'm here to help you."
Well, I don't need or want help like that. But, if I want to derail a discussion by having people scream their opinions at each other while holding for their ears, I'll be sure to ask.