Without increasing the height you can add one of these: www.abcbarbecue.com>slow-n-sear
An even cheaper option is with a few firebricks, a 20 inch pizza pan as a heat deflector & using a fuse method you can use the entire surface for cooking & it'll run smoking temps for 8-12 hours
Canjun Bandit is what I was thinking of - Although the Smoke EZ is a little bit bigger it seems. My friends who live about 1.5hr away bought a kettle just for when I visit, and insisted on buying a WSM for when I visit as well. But I don't want them to spend that kind of money on me, so I told them they can get a conversion kit for their kettle and save some cash