Good news: it appears JBPatch works with some minor adjustments to the code on K3.
Log start timestamp: Fri Oct 12 15:36:54 GMT 2012
Bootstrap OK, PatchingClassLoader instantiated
Packages still handled by original ClassLoader:
JBPatch version 2.4.0: initializing patches
I: Directory synchronization thread started
I: (builtin) DeviceInfo registered for com.amazon.kindle.settings.dialog.Device
I: Patch policy initialized
@ixtab: How does this look to you? Can I get started writing a patch for the K3?