Which PDS NIC are you using? If it's the Asante with the removable ThickNet PassThru Board . . . you, sir, are in luck!
IIsiColorPivotII_PDS_Card_HackProject™
The Cards are dirt cheap from macmetex on eBay, you just need to build a cable, running wires from the jumpers (or their vacated thru-holes) on the Card to a Da-19 connector to bolt-up in place of the baled Thicknet DA-19 connector on the Asante Card. Using a DA-19 Gender changer is probably the easiest way to go, but I digress.