No problem, as long as you are comfortable with not using that socket on the laptop again. If there is a Wifi card then the riser has a USB d+ and d- pad that is probably unused, or you can lose the internal camera and use the 2 data wires for the device. you will need to get 5V and ground from somewhere though, as normally a usb internal webcam has a switched power rail.
If you get a service manual for the laptop you will probably find there are unused USB ports on the chipset.
I did this with my EEEPC, to add extra USB memory, using the internal camera port ( Where I found out about the power switching so went to the board to get 5V) and the unused riser usb connections to add 2 flash drives stripped of housing and connectors into the casing. I used 24AWG network cabling to wire them in, and taped them down to assorted patches of board where they would fit.