For high risk pregnancies, I would go the public route as they have the best care. Select a public hospital that you will probably go to, then ask for a list of private doctors accredited with them. These doctors have a "key" that will allow the public system to access your files should there be an emergency.
Mine was a high risk pregnancy and that was what I did. I had my checkup at the Prince of Wales, had asked for a list of private doctors affiliated with them and chose a private doctor off their list who happened to be from the Union Hospital (a private hospital near them). This was 4 years ago, though.
If on HK island, you can try Lucy Lord. She is more connected than others to Queen Mary since she worked there years ago. I had seen her for the delivery of my first child. Second child became very high risk for pre-term birth, and so she help set me up with public system. Baby was delivered at 28+ weeks, and very, very well cared for by the public team. Even as a premie, the hospital allowed my husband to be present and was very supportive. Our tiny baby stayed at hospital for close to 2 months, but is now a totally healthy 9 year old. For high risk, you need to be prepared to go with the public system, since they have absolutely the best care for premies.
Simplythebest is this a reference to premies and breastfeeding at public hospital? Our son was unable to drink liquids until he was almost one month old; he was feed via tubes and IV. The hospital was still supportive of breastfeeding, and stored all the expressed breast milk until he was able to feed naturally on the breast.