Someone did this a few years ago when Baitcion was still at Mink Hollow. I think it was the same year as the Chocolate covered grasshopper and mint ice cream. If memory serves she used a vanilla recipe and added some cow's milk to make a small batch. She flash pasteurized it on the camp stove. A few people, myself among them, didn't taste it until we learned the human breast milk in it had been pasteurized. I think "Cooking for Geeks" has temperature ranges for pasteurization. I would go with the temp ranges meant for cow's milk or higher.