Another option for grilling on the WSM is this one that I discovered by accident or out of necessity. I was low on charcoal and needed to grill some kabobs. I was done using the WSM, but the fire wasn't out.
I discovered that the cooking grate will fit and rest on the top of the nuts that secure the legs to the base of the WSM. You can leave the charcoal ring in for more stability or remove it. (Since discovering this, I have since put an extra nut/tap on each of the top three bolts for more stability.)
The distance between the cooking grate is comparable to the kettle, the base will help reflect the heat better for higher cooking temperatures. And if you have a small kettle, the kettle lid will fit the base and it is just like cooking on a small kettle.
If I have quite a bit of charcoal left burning after a cook on my WSM I will remove the mid-section and seal the base with the kettle lid. I have found the charcoal extinguishes faster by using this method. (But in my case, that is because I have a leak in my WSM that I still cannot find.)
Beers to all,
Juggy D Beerman