Official patches will fail to install if files on Kindle are different than what it expects. That's why you need to manually revert these unofficial patches, install offcial ones and then reinstall unofficial patch again. So there is very little chance of bricking the device by official patch.
As to why Amazon ignores the unicode - they only care about books they sell from their store and since none of them are non-latin (and for those few that are they embed fonts). Since there are always features that don't make it to the realease I'm sure unicode support gets cut every time they get close to shipping new version.
For the same reason - it doesn't hurt their ebook sales I don't think they'll be too unhappy about this patch either way just as they ignored the screensaver patch.
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