As others have said, healers are not as gear dependent for AK, provided you have a party who doesn't get hit by everything. DO at the very least buy level 48-50 items to upgrade anything you have that's behind (ex ring, necklace, wrist, belt, earring).. at least on my server, these items are relatively cheap. Better yet, you'll make the money back when you convert them later. I successfully have healed AK many times in AF + White Accessories + Ifrit's Cane.

I do suggest you buy the DL Wrist early on though. AK doesn't drop wrist gear, so that'll be a good upgrade.