The occultist (Occult Adventures) has some of the flavor that you want. I realize that the school implements and the focus powers aren't (necessarily) "magic items," in and of themselves, but they can act in a similar manner (and even be made into such as the character gains levels).
Depending on exactly how you want to go about it, a bard (silver balladeer; concentrating on musical intruments), inquisitor (relic hunter), or medium (relic channeler; concentrating on the relics used to bond with each of their six spirits) may also be an option.
Kinda? A magus can improve wand DCs with the right arcana (and use them in spell combat with another), a razmiran priest sorcerer can use their own magic to power wands and scrolls which is kind of like the second, item mastery feats (best used by a thoroughly multiclassed martial character) can get extra (if different) uses out of magic items. No one character does all of those well though, and a rogue isn't good at any of them.
Further the cyphermage PrC gets bonuses using scrolls, as does a level 10+ scrollmaster wizard, and various alchemist discoveries and some alchemist infusions boost potions. Not recommended for combining with each other or the above.
Hmm. There's a wizard arcane discovery, staff-like wand, which improves wand DCs/caster level. Requires craft staff as a prereq so very late game. You might get it with VMC Wizard after taking one of the other means listed above.
There are magic item mastery feats in the weapon master's handbook that allow you to cast fly is you have a magic item with [X level transmutation spell] as a construction component, and dispel magic if it has [X level abjuration spell] as a construction component.
Might be worth looking into.
