Interesting yet strange question. I would like to connect the USB end of a USB to Serial adapter to "X" device. This "X" device would act as a USB host and convert the incoming data back to serial. From here, I can add a bluetooth Serial link, wifi, Ethernet ect, and on the other end convert it back from Serial to USB.
I know the first question will be "Can you just bypass the initial USB to serial adapter?"
-No I cannot. The product I am trying to retrofit is an enclosed system.