Recently Amazon rolled out an update to Kindle Paperwhite(Generation 1) which added functionalities like vocabulary review, which are nice. However, one big problem I'm having is that it somehow deleted the KaiTi（楷体） Chinese font it originally had, leaving only SongTi（宋体） and Heiti（黑体） as possible choices. Those fonts have a very tight line spacing which makes for a difficult reading experience.
I read from users who register at Chinese Amazon that the updated Kindle Paperwhite should automatically download KaiTi（楷体） and YuanTi（圆体） once it's connected to network. However it's not happening to me. If I have to deregister my Kindle and re-register it at Chinese Amazon just for the sake of fonts, it'll be quite a pain, not to mention I'll probably have to re-download all the books I have in US Amazon account, plus the potential loss of some reading progress. Therefore, is there some way to update the Chinese fonts on a Kindle PW which is registered at US Amazon? Thanks in advance!