Here is one more option to consider. No changes to cooking the flats I mentioned above, but how about making lollipops with the drumettes? The main advantage with this prep is that the ball of meat cooks more evenly, and the saucing hides areas of missing skin. I use scissors to snip any loose tags and to shape them. Foiling the bone will protect it during the cook, but sauce the bone when setting the glaze. For brining, arrange them upright to help them keep their shape. Notice I did remove the knuckle on the lower ones.
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These are drumstick lollipops, but you can get the idea of how the drumettes will look. Top photo is Blues Hog Competition, the lower ones have Blues Hog Original.
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Now this was a practice box, and I literally grabbed a handful of parsley just for a background color to see the color af the sauce looked against the greens.
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This video has a good section on how to lollipop both flats and drumettes.