Mini USB Audiointerface based on CM108B ( like USB Audio Dongle - CM108B or better )

I need a small USB 2.0 device with stereo input and stereo output
I'm looking for a professional who can create something similar to this (see link)
but with one change:
L/R line input
L/R line output
See pictures below

So, mainly the professional has to modify a project create and provide me the schematic
plus create the PCB and follow the first creation

Further explanations by chat
Budget 175 USD