Aviation companies in Hong Kong have always had carte blanche to request work visas from the HK immigration department due to a lack of locally available talent, but times have changed. If you are a
PR holder in Hong Kong and facing an uncertain future, your company cant let you go and then keep someone who is on a work visa sponsorship.
I have engaged the Hong Kong immigration department and they confirmed this emphatically.
Drop them an e-mail or a call they've been very helpful. The labour department will also help you in regards to your employment safety for permanent residents.
Hope this helps.