I am an experienced Win32API/Directshow C/C++ developer. I also develop .net applications C#. So it doesnt matter for me the language since interfaces are same , it seems that you require some trick , but i am sure that it doesnt worth more than 100 usd. And be sure that it wont be 5 days long , if wrote 5 days for "worst case" situations.
If you want proof of my directshow knowledge i can send you source samples upon your request.
BEST REGARDS