following page 24, the attached script fixed active content on my kindle dx white (dxi, b005*), device id A13V1IB3VIYZZH.
Firmware 3.4 (3.2.1 > 3.3 > 3.4 update).
Script started through launchpad custom updates.
crucial point is that k3/${JPATH}/b/c.class also needs patching, otherwise active content crashes with
"Unexpected device type. Unable to load keyboard image data for device family member: A13V1IB3VIYZZH"
Tested with KindleNote