Australia has a fantastic quality of life. I think you'll be happy there and it likely addresses many of the issues you have with Hong Kong. It's also known as the working man's paradise, minimum wage is $18 so even low skilled jobs are reasonably paid.
Public health and public schools are decent. People value quality of life above work so working conditions are fairly relaxed.
Any job involving physical labour of some form is well paid because most people want office jobs. Bus drivers would partially fit into that category, it looks like the typical salary is around $25 an hour which would put you at $52,000 a year. Plumbers and electricians are very well paid. Since you already have some money you could do this part time. Often part time jobs pay a higher rate too. If you and your wife both work part time it would be very attractive because you are taxed as an individual not jointly and your tax bracket part time would be very low. Also look into the family tax benefit. At your income level you would likely receive an additional $15,000 per year to support your family from the government. It's only income tested, not asset tested.
If you want a relaxed, happy suburban life Australia is great. Because minimum wage is so high some things are going to seem expensive to you, especially anything involving you being served by someone: restaurants, massages etc. So you would likely eat out less (have friends over for dinner instead) and go to the beach more. I think it's a good trade especially in your 50s.
Another piece of advice. Move somewhere like Brisbane where cost of living is lower than say Sydney, life moves at a slower pace and the weather is much nicer. Stay away from Sydney. Melbourne could be OK but it's cold in winter and really hot in summer.