I've repacked the Chinese 1.28.1400.6 update to experiment for my own use, so thought i'd share it here.
It is the update with all Chinese removed, missing bits added and optimised with the MCR build system. It should be flashed via ClockworkMod recovery, and you MUST back up first! To flash, first flash the 'tomcr' update zip, then the ROM update zip. If you are returning to a stock based ROM without wiping /data, you must use the 'tostock' update zip before doing so.
There are 2 known issues, the first is that a 'data connection status' icon persists in the top bar, the second is that, due to the Chinese origins of the ROM, the option to add / edit Google account settings is missing from Accounts and Sync. You can add accounts however via the settings menu of the Gmail app.
Enjoy, let us know how you get on!