Once sweet potatoes are somewhat cool, gently remove the flesh with a spoon, trying to keep the potato intact. Add the sweet potato to a large bowl, then mash with 3 ounces of goat cheese, cinnamon, nutmeg, salt, pepper and honey. Taste and adjust seasonings if desired, then scoop flash back into the potato skins. At this point you can re-warm the potatoes (if you let them cool completely) in the oven, then top with remaining goat cheese. Add grapes on top and serve with additional drizzled honey.