You might be able to do it semi-effectively by getting the mobs in range of a VoidWalker and using the voidwalker's Suffering spell to build aggro on everything within 10m. If the Voidwalker does start to take too much damage then you can Health Funnel though I am not sure if that builds aggro on the Warlock or Voidwalker or both. For gathering the mobs quickly you could try to use the eye of killrog to speed around and group up mobs and then when the eye goes down the mobs should aggro to the Warlock and if the Voidwalker is next to the Warlock it's Suffering AoE should get them on it.
A SoulLink Warlock would likely be best for the above and having a Priest nearby would allow for some additional healing on the Voidwalker though eventually that may cause the aggro to shift to the Priest (which would be fine if the Priest can tank the incoming damage).
Overall a very tanky healer like a Paladin is likely one of the best options due to the self-healing and high mitigation.
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