There is very high competition from Hong Kong high school students for places at university, so, your actual academic qualifications would have to be up to scratch. I can't magine that your impressive work record would hold any sway in entrance to university. You would be able to study whatever subjects you needed for university entrance including Chinese. You would be best contacting one, or several of the universities that specialise in your preferred subjects and asking what was needed for entrance. They all have websites detailing their courses and contact details. I'm quite surprised you haven't already done this as it would seem the obvious way to start such an endeavour as you're planning.

If you're planning on marrying your spouse be prepared for some strange questions - dictionary definition "spouse (spous, spouz) n. A marriage partner; a husband or wife.