Would this still work with out the trusts being boosted from the campaign that's going on right now?
It wouldnt. You would need to manage all 5 trusts to get hit outside of campaign to split the damage more.
Ulmia, Monberaux, Arciela and Joachim would normally die from 2000 damage.
I'm going to have to wait and see how this works as your right his HP is only going to be about 1410 but he always has that stoneskin up that eats about 400 damage. So we will have to wait and see if that's possible... but yes it's going to ride the line.
However, we in no way need the trust event to pull off this strategy. All other trust are far above 1666. ideal WHM for this strategy is Ygnas. With him in for Yoran this strategy should work perfectly fine (that's what Lute did) Sadly he's the only trust I dont have... should have him in a few months. So strategy with this trust setup may be quite risky without the event indeed, however with Ygnas it shouldn't be an issue for this strategy.