Arcanist Multiclass options

Hey guys. Pretty self explanatory. Need some Multiclass options for my Arcanist. Yes, yes, I know that Arcanists, like other casters, stand well on their own for the full 20 levels. Humor me

He's level 10 and has a summoner build. Due to plot, he's spent a long time in a library, away from the party, devouring knowledge and research. I was thinking a flavorful dip into Investigator for the inspiration and never fail a knowledge check again.

Any other suggestions? Let's get crazy.

If it's just inspiration you're after: AMATEUR INVESTIGATOR

A single level dip into wizard and sorcerer, to make use of the Blood Arcanist archetype and the School Understanding exploit. The powers you can get from your bloodline and chosen school can more than make up for the hits to your caster level. Picking the right archetype for either class can get you some heavily front loaded abilities.

If you can meet the prerequisites, the Magaambyan Arcanist prestige class might be a pretty good fit. You've been studying up on how druidic magic interacts with arcane magic.

Also has some prereqs, but the Pathfinder Savant is a prestige class that are

specialists in the theory and practice of magic, illuminating mysteries of the eldritch fabric that permeates existence. The path of the savant brings expertise in the lore of glyphs and sigils, knowledge of exotic spells, and the power to unlock the full potential of magical devices