I use XeTeX on a daily basis, Jonathan ('tho XeTeXcharclass far less
frequently) and would be happy to test your version on my production
suites, but in order to do so I would require a Win64 (or Win32) build.
You can test the new experimental XeTeX on win32 by
http://members2.jcom.home.ne.jp/wt1357ak/xetex-exp-w32.zip
The file will be removed in due time.
Best,
Akira
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