Hi have you thought about advertising for a local driver, maybe somebody who has retired from bus driving or similar? they would know the streets of HK very well. You could try contacting Smart living, which is HK gov own website for helpers they provide local trained helpers, full time, part-time and temporary, and all very legal, and ask if they provide scope for drivers.
Read More There should be some contact details on this site for you to enquire about drivers.