You'll do a little better with Planar Binding (6th) (if you pick up the associated required spells - Dimensional Anchor (keep them on this plane, 4th), Magic Circle Against Good (to hold them in spot, 3rd), Dispel Magic (in case you need to get rid of the Dimensional Anchor; 3rd) and Dismissal (for when things get ugly, 5th)). In a pinch, you can do without Dispel Magic and Dismissal... but I wouldn't recommend it. Depending on your DM, you can get away with a Planar Binding without the trappings, and treat it much like the Cleric's Planar Ally.
Edit:
Do note healing isn't an arcanist's forte.
However, the Sorcerer can (potentially) cast Cure spells directly. It's the only Core class that has wiggle room in where they get their spells.
Edit 2:
If the party is entirely made up of Warforged, then the Wizard/Sorcerer can know the Repair line, and do all the healing that way.
If the Rogue or Bard has lots of ranks in Use Magic Device, then a Wand of Cure Light wounds is only a DC 20 roll to activate.