Sorry about the confusion, but it really is best to buy a printer with this sort of thing in mind. I don't know what the inkjet world is like, but it isn't uncommon to find new laser printrs that claim to support OS 9 and earlier (oftentimes the specifications will even say so).
But since you have what you have, the only way to get the printer talking to an old computer is to use some sort of network setup to handle it. Ghostscript will do the translation between quite a few protocols, and I believe that CUPS will accept lpd connections (and you can get an lp client for OS 9 and earlier). Which means that you may get away with using OS X as the print server. Note that this is all speculation since it has been a good long time since I looked at the documentation.