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The way I see it you can add just about anything you like! Something else you may want to think about is adding some leftover smoked pork butt or brisket.
My advice is to try Dutch's wicked baked beans and try it with bacon & sausage!
When I make Dutch's wicked baked beans, I have used Pulled pork, Sausage links cut small, and bacon, I even have used Buckboard bacon as well as Canadian Bacon.