The waveform is stored in a chip attached to the display, so that is not the problem. The real problem is that each kindle model uses a different eink display CONNECTOR, which is soldered to the kapton flex cable. They do not even have the same number of pins, and the connectors are not something you will find at your local electronics store, so good luck building an affordable adapter. Then of course, the waveform data in the attached flash ROM chip may be stored in a different format, so there could be software conversion issues as well...
A K3 is still fairly useful without an eink display if you can turn on the Voice Guide mode. With SSH, you could continuously grab and display the framebuffer image to help navigate the framework menus.
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