I believe it is possible, but I have no idea how to tell you to do it if you are in true DOS. However, are you in a DOS Window, even if you are running full-screen? If so, what OS? 9x, NT, 2k, XP?
I *THINK* you can setup the system to redirect LPTx to the USB printer. I know if this was a network printer, you could capture a printer port, but since the printer is already on your system, I'm not sure. I don know I have an option for USB in my BIOS that allows me to use USB in DOS, but since you have to direct a print job to a port, I'm not sure how you would do it. You might be able to share the printer to your company's network, and then capture that port, but I will admit that I really don't know what to tell you. Hopefully, this may put you on the right track, anyway.