Mix together the breadcrumbs and vermouth in a small bowl and set aside. Let breadcrumbs absorb for about 20 minutes.
Mix together ground pork, egg, sausage, egg, Parmesan, 1 tsp. thyme, 1 tsp oregano, 1 tsp kosher salt and nutmeg (this is easiest done with your hands). Add bread crumb mixture and mix together thoroughly.
Form meat mixture into 24 medium-sized meatballs.
Pour one jar of marinara sauce into slow cooker. Add remaining salt, oregano and thyme. Chop dried mushrooms and sprinkle over sauce, then stir gently to incorporate.
Nestle meatballs, one at a time, into the sauce, leaving space between the meatballs as your slow cooker permits.
Pour enough marinara over the meatballs so that meatballs are just covered with sauce. Cook on low for 8 hours our high for 5-6 hours.
Serve with fresh-cooked al dente spaghetti topped with fresh grated Parmesan and chopped fresh thyme.