That is my preferred method though before I got a WSM-capable dutch oven I simple fashioned a pan out of foil, placed the smoked ribs in atop lots of sliced onions, garlic, sometimes other aromatics like dried chiles, sometimes dried fruit, then drizzled it with a liquid reduction and sealed tightly, returning it to the cooker to finish. Now, I do the same thing in a CI dutch from Lodge.
Contrary to most standard recipes, little liquis is actually needed if you go whole hog on the aromatics, especially the onions, as they release lots of liquids.
This is a method I use sometimes for chuck roasts, and have used it with short ribs as well, and
here is another approach I used for chuck roast (scroll down to below the tri-tip description) that I have also used for short ribs, the only difference being that I chopped the dried pineapple more finely. In all cases we ate right away, but had leftovers a day or two later which, owing to the time in the fridge, had better flavor. (For eating immediately, simple pour pan/foil juices into a fat separator and separate out most of the fat.)