In the west, there are a lot of very specific roles whereas I would say the roles in HK are more broad. Hence it's important not to dwell on your abilities as too focused, and don't be so general that people don't understand what you're saying. Cover the basics and your accomplishments in each relevant area, don't leave out important areas, and tie in your abilities to revenue. I would say a lot of western people fit that bill in being too generalist. It might work in the west but to come here cold turkey, you need to be able to effectively communicate your abilities, not trying to get by with pub talk per say. I would say HK roles are very revenue focused too.
Hiring from abroad or locally. Most roles are immediate needs, you want a job to start like now, right? Hence for those roles they will focus on locals. This is super easy to combat. Hi, I'm in town this week of Feb and available for interviews. Simple. Email is widely used so a local number isn't necessary. I would avoid putting information like age and address on your CV. I would think an overseas address or certain age could detour some people from reaching out to you.
Hiring from abroad. It's possible but personally I like to be there in person. Make sure that you like the environment and people.