While squash bakes, prepare filling. In large dry saucepan, toast wheat berries for a few minutes, stirring until they become fragrantly nutty. Add hot water, pouring in slowly as it will sputter. Bring to a boil. Reduce heat and, with lid ajar, simmer berries for about 1 1/4 hours, or until tender but still firm. Drain and strain when berries are as tender as you’d like. Transfer to bowl. Add arils, chopped toasted hazelnuts, hemp hearts, parsley, and Chinese five-spice. Drizzle with orange juice and gently fold together to evenly blend. Add more seasonings, to taste, if you wish.