Not exactly answering your question, but if you decide to skip the 100% homemade option, Penzey’s makes a nice mulling spice blend. Customize it a bit to taste, and it’s all good. Penzey’s is a good company too, and they have a store in the greater ATL area (Sandy Springs).
By this time of the year I am worn out after coming up with meaningful gifts for Kiddo’s teachers (12!!!) and extraneous in-law relatives, so I’m happy to use readymade, including Trader Joe’s Glühwein.