Share the USB printer using whatever share name you like.
Then, at a Command Prompt type:
net use lpt1 \\computername\printername /persistent:yes
...where computername is your computer's name and printername is the share name you chose when you shared the printer.
Now you can access your USB printer as LPT1 as though it were on another system on the network. The "persistent" parameter ensures the printer is re-connected to LPT1 each time you logon.