Try Quest Software in California (NBSPOOL product).  Also, Minisoft
Corporation in California has a product that can do this.
Unfortunately, I am not at work, and do not have their phone numbers
here at home.  If you need their phone numbers, e-mail me back, and I'll
get back to you on Monday.
 
BTW, some printers are capable of handling NetWare's IPX/SPX protocol
and TCP/IP at the same time.  An example is the HP LaserJet 4 Plus and
4Si with a JetDirect card.  If you have this capability, you can
configure the printer with a TCP/IP address, and configure the printer
on the HP 3000 in NMMGR, and get a product like NBSPOOL (or just wait to
use MPE/iX 5.5).  This is what we're using.
 
Good luck!