This is pretty out there, but give Enchanters(or maybe other classes) the ability to summon a Hideous Abomination or Feral Elemental. Just a mob that is the max level for long duration charm, so that enchanters can have a solid pet in places where they would otherwise not find one. If you want it to be more stable/reliable, make it die when the enchanter dies so it doesnt rage on remaining raid members.
It would have to be a fairly wimpy pet, lest its DPS combined with the DPS from GoG and AoD consistently outshine a Mage. Maybe 2/3 of Mage pet damage. If any mained Enchanter would really want to go through all the trouble for such shackled DPS I guess that might be worth doing, but I have doubts that they would.