A few observations:
1) My firm recently engaged a person on a visa. The--sorry for the use of a word we have established is incorrect--"transfer" process was every bit as painful as any initial engagement I've been involved with. My personal impression has been that PRC citizens are getting VERY careful review.
2) Those that are eligible should get on the "top tier" visa. It's an eminently sensible program. I believe the particulars are that one need have been in HK at least two years (so it can occur at the time of the first renewal) and have earned HKD2,000,000 in the last year, as evidenced by your HK tax return. I believe if one is in good standing and meets the criteria, then it is more-or-less automatically granted.
I reviewed this program and the Quality Migrant program and could not discern any real advantage to the latter (besides possibly sounding cooler). The TT visa holder can switch jobs without the permission of ImmD (although he does need to notify them of updated job status) and he need not apply for leave to stay in HK should he leave his current role. I believe that a standard employment visa is technically invalidated upon leaving employment, although in practice it seems that ImmD is happy to let visa-holders stay. The TT holder has an edge in the job market, as a new employer need not apply for a visa for that person.
Anyway, the TT program obviates some of the inconvenience that OP is in, being tied to a company.