It depends what you mean by “dispatcher”
CX Flight Dispatch is not flight dispatch in the American sense (i.e. FAA Licenced dispatchers). It is more of a sophisticated briefing unit. All staff are locally employed.
Ops control is all local with the exception of 2 long serving expats (shortly to be only 1)
Crewing is all local except a few management/specialists
Unless you have HKG residency and are prepared to start at the bottom and accept local terms, there is no chance.
Sorry.