My user-space code covers the Minivan, Dimple, CRKBD, and Teensy based HHKB converter. My code makes extensive use of @Drashna's code and much love and praise goes to him for figuring a lot of this stuff out!
My usercode utilizes the layout wrappers contained in wrappers.h. All of the keymaps are derivative of the Dimple keymap and utilize its wrappers in the definition of additional wrappers.