The CY4611B code is of mass storage BOT class. If you want to talk to the device using CyUSB.sys you'll have to develop a API layer over it which can handle file system and mass storage BOT. Not a great idea plus it will be time consuming.
You can modify the BOT side of the code to reduce the overhead. In this case you'll be developing your own custom stack.
We don't have an example which does this but this would be one way of doing it and you can use of our examples as reference codes.