I would say the jobs in HK are different than the jobs in the west. It's easy to say that you did this and that in your previous role but fact is that role likely doesn't exist here (the title might but it's important to read between the lines to see what the prospective job really is). It's important to know your skills and abilities and the jobs available here along with the skills needed for the HK role, then rework your CV in HK terms. If the people here can't understand your CV, then you get the blank faces and feel like you got on, but at the end of the day they didn't understand one word of what you said and the result is you don't have a job.
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.