If I am hearing this right, you have two issues...USB access and driverless/wireless printing. Others have USB printing, we don't. However, we have HotSpot Printers that no one else has. http://www.printeron.net/landing/ricoh/Ricoh.html
I am going to assume that you are not familier with this. HotSpot printers allow you to print from anything that has email access including iPhones or BlackBerries. You don't need drivers and you don't need to be on the network. You just email the file to a designated address. A minute later you receive an email with the release code, go to the printer and put in your code and out comes your print charged to your credit card. The customer gets a credit to their account just as if they had sold a piece of merchandise.
Right now you have one color unit and one B&W unit as options...SP4100N-KP and the SP C410-KP. If you can convince them that this is the way to go, you eliminate all competition except for others in the Ricoh Family Group. You can find plenty of info on Aficio League to get you started.