I got the idea for doing that right here on this site, I think. The campaign where I was going to use it, unfortunately, had a TPK in an unrelated encounter, and the game picked up in Saltmarsh with new characters. So it's still dangling out there, waiting to be used...Return to the Keep on the Borderlands is an excellent iteration of the KotB. And I have used Mendel the slaver as a link to the Slave Lords. He worked really well as a tie-in. I based Kendall Keep on the edge of the Lortmil Mountains and then used a couple of one-shot adventures (thanks to Dungeon Magazine) to link through Verbobonc and then Safeton out on the Wild Coast and Scourge of the Slavelords.