Nothing I'm aware of that is commercially available. You could make your own, or just plug in only one bank of USB for the front and then the card reader into the other bank.
Another thing you can do is buy one of those PCI USB cards that has the internal interface connections on the card as well.
Here's an example: http://www.newegg.com/Product/Produc...82E16815201008
If you look on the PCB right next to the RoHS logo, you'll see the card has the extra USB header you'd need to make this work.