Hi,
What you're asking for is (partially) a "wrapper" library.
Good new is that I'm very familiar with c#, cpp and windows api (dll libraries).
I'm not extremely familiar with FBX but since you can export FBX in XML format (similar to Collada with whom I'm familiar)- I'll be able to get around binary version without too much trouble.
If you want demo prior hiring - cool, create smaller project and award it too me. Either way 30% initial milestone is advance payment.
I'm almost 4 years in this business (as a freelancer) and payment is always a problem!
I know it would be ideal if we all where from China/India and able to work for a cookie.
Regards,
Zeljko J.