I've been kicking around this theodicy in my head for a while (several years, actually) and I thought I'd share it here to get some input.
Some classical theists, such as David Bentley Hart and David Armstrong, have argued that classical theism entails two things.
The first is universalism. In classical theism, God is the source, sustainer, and end of all creation. If creation does not meet its end, it is a failed creation, which means God is not really God.
The second is a multiverse. In classical theism, God is pure actuality, which would entail that God has no potential, meaning that any universe God can create, He does create. (Hart and Armstrong have different arguments for a multiverse, but that just strengthens the case.)
It would seem to follow from these two ideas that God has created all possible universes and that this whole multiverse will be deified.
Presumably, God creates some (I don't think we could ever have an idea of how many) universes where there is no suffering. But, it would be better if there were also universes where there is suffering, as long as that universe reaches the natural end it was created for (ie deification and perfect bliss). Our universe is one of the many universes where there is immense suffering.