So to summarize, no workaround i know of with your current setup. However, $300 will buy you a solution. Hope that helps...
Since a new Epson printer that works with OS X would only cost under $100 or so, it's cheaper then a $300 solution.
Loudnotes, you can't IP print to it because that would need the driver on the OSX machine. There are more Epson drivers out for OSX now, so I'd check again for it. If it still isn't there, you will either have to set up a simple network and let the OS9 machine do the printing, or spring for a new printer.
Before calling apple support though, check their discussion boards. I've found more answers there then anywhere else.
http://discussions.info.apple.com/