You could rune your charmed pet at a push (to last both fights)? Or grab a pet from the basement for the 3rd mob (werebat or whatever is there first) and add some nukes or level 4 mez interrupts on the casting hag to make sure pet wins and has a small amount of health left.
My initial thoughts - never done that camp on an enchanter. Do tell the MR/fireplace guys not to panic if they see a random werebat/pet running by
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