If you don't mind cheese just pick up one or two deathfog barrels in the ship.
Take 1 barrel with you, go up the ladder to avoid dialogue and come from inside fort joy (2 random Magisters will not start the dialogue, just stay out of Dallis' sight) and put the barrel next to Alexandar.
Ofc you need to be undead for this to work, Dallis will fly away with Alexandar as said here before, now you bullrush into the fog and then retreat towards the ladder again, so the ranged magister has to move inside the fog to hit you.
Everyone will try to come after you and die to the fog, play dead to get rid of the yarrow magister, so you can still do her quest (you need to bribe her first, because she will have -35 attitude9.
This way you can do this at level 2, but ofc the hammer being level 5 will give you -50% accuracy at level 3.
