HK local consultant contract

Dear All,

Let me explain my "complicated" situation : I'm currently working in France as freelance for a french company. That company has a HK based subsidiary which wants me for a 6 months > 1 year mission period.
They want (and I agree) I still work as a "consultant" (freelance) in HK.
I made searches on internet and the only solution is to negotiate a renewable permanent consultant contract (or agreement) as I cannot create my local company and work for it (and there is no Freelance contracts in HK). They also told me a 6 months contract only (renewable) will prevent me from getting the visa.`
First, is this true ?

Then, they refuse the permanent contract because they are afraid this type of contract is, from the point of view of the HK administration, a disguised permanent staff contract.
There is any difference between a permanent consultant contract and permanent employee contract ?
Because my idea was to propose them a HK permanent contract to become a normal employee and ask them to fire me at the end of the mission.

But, I wonder if :
1) this type of contract in HK will impose some state taxes of costs for the company
2) the HK contracts can be ended easily by the company without any cost

I also found and contacted the hubconsult.com website (no answer yet). They already have a local company and sign consultant contracts with freelance people. Does anyone know this service ?

I would really appreciate your help ;)

Regards.