Just for fun, I threw together my own take on it.

Lore:Thavnair. Because Alchemy.
Weapon: Blowgun. Deals damage and extends any existing potion damage effects.

Salve: Single target heal. Spell.
Gil Toss: Single target attack. Spell. Damage increases with more damage over time effects on target.
Bomb Fragment: Single target fire damage. 3 Charges. Restocks 1 Potion.
Potion: Restores target’s HP. For the next X seconds, area of effect heal over time. 3 Charges. Restocks 1 Bomb.
Oil: Covers area with oil. On bomb effect, all targets in field gain immolation. Immolation: Take fire damage over time.
Hi-Potion: Restores a medium amount of target’s HP. If used with Potion active, increases effectiveness of heal over time effects received. 2 Charges. Restocks Arctic Wind.
Hide: Evades next attack.
Restock: Reduces recast on all potions by X seconds. Spell.
Phoenix Down: Resurrects target to a weakened state. 4 Charges per fight (shares charges with all other in-combat resurrection actions).
Auto-Potion: If target drops below 50% HP in the next 10 seconds, follow-up with last healing potion used. If target dies, restocks 1 Phoenix Down.
X-Potion: Restores a large amount of target’s HP. If used with Potion active, heals X potency to all targets within an area. 1 Charge. Restocks Heavenly Wrath.
Gyshal Green: Line AoE. Spell. Causes stampede of chocobos to deal X damage. Spreads AoE effects of any field it passes through.
X-Item: The next potion thrown activates twice.
Arctic Wind: AoE ice damage. Binds target. If immolation active, ends immolation and gains drenched status. Drenched: Take additional lightning damage. 1 Charge. Restocks Hi-Potion.
Heavenly Wrath: Single target lightning damage. Gains Forked Lightning: Deals lightning damage over time to self and all adjacent targets. 1 Charge. Restocks X-Potion.
Smoke Bomb: For next 3 hits, all targets take 10% less damage. Lasts 10 seconds.
Vanish Edge: Targets are vulnerable to item-based non-elemental damage.
Dark Matter: Draws targets in to centre of AoE, doing high non-elemental damage over time. If Immolation, Drenched, and Forked Lightning active on any one target in field, damage dealt to all targets is increased. Restocks Bravery Potion.
Reverse Mote: Reverses any damage incurred to target over the last 3 seconds.
Bravery Potion: Buffs damage dealt, damage reduction, and max HP for next 8 seconds. Does not replenish automatically. Does not stack with other buffs.
Nihopalaoa: Reverses nearby healing effects on target enemy.
Rat Tail: Boosts effectiveness of next potion.
Transfuse: You lose X HP. Target gains double HP lost.

LB3: Megaelixir: Blue dialogue box appears with Fight, Magic, Item, and Run. Floating cursor moves down to Item and selects Megaelixir.

Traits:
Compounding: Using certain potions restocks others.
Mixology and Mend: Increases base action damage and HP restoration.
Item Pouch:If an action grants you an additional charge, you can exceed the maximum number of charges available for that ability.
Bartender: If an ally gains a beneficial effect from a potion, you receive half the effect. Effect procs once per potion.

Idea here is that you'd have a healing job that doesn't operate off of MP, but instead uses item charges to deal out healing and damage. There are a few traditional spells in case you mismanage and run out. Healing items replenish charges on attack items and vice versa. End goal should be to reference as much of FF's item lore as possible. Vanish is a reference to FF6's Vanish+X-zone trick.