I've never tried a turkey in the Nesco I had once upon a time, but did a goose, and I never could get it to brown right. Granted, I had no experience, but the goose more steamed than roasted. I'd try a way to do sides in the Nesco and use your oven for the meat.
By the way, the sweet potatoes, green bean casserole, and stuffing can be cooked in the microwave oven, then, after the meat comes out of the oven, put in at a high heat to finish -- i.e., make a crust on the top -- while your meat is "resting". Believe me, don't tell anyone (Julia would be proud of me) and none will know that you started the sides in the nukulator. I don't see why doing the sides in your 3-section insert to the Nesco wouldn't work as well.