Rob - a colleague and I had an email exchange with Dave at WASINC last year about jobs out there with an Excel/XLS rating, the problem you have is that your licence firstly needs to be validated in China on your current type, then you're free to transfer to another type as required, but unfortunately there appears to be no Excel/XLS aircraft operated commercially (when he and I communicated) to enable the CAAC to validate your licence on this type, so you're scuppered. Seems hard to believe I know.
That's the reason job listings out there specify a rating on certain types when it may not necessarily be the type you're applying for or will eventually operate. I hope I've explained that well enough and of course things may have changed since last year in regard to Citations in the region.
With an Excel/XLS rating on your licence and job hunting in Europe, you're definitely right to let your other half take the lead!