thank you very much for the asesome install package.
I could manage to install V3.3 (from my updated Kindle K3W V3.3) to my DXG by simply repacking (and signing) your update_k3w-3.1-create_updater.bin with 3.3 key.
Also nearly all the other hacks I'd tried are working after the same repack procedure.
(f.ex.: usbnet, german language pack v0.91, launchpad, fbreader, etc.)
If you also want to try it, do it with the kindle_update_tool.py - and updated V3.3 sign key included (but still at your own risk :-):
1. step: unpack .bin to .tgz with e option, then
2. step: repack .tgz to .bin with c option and --dxg suboption
Only TTS I could up to now not make working, don't know if this is a side effect, because I've not resetted my DXG before upgrading.