I believe you are at the end. If it were simply a printer, there are possible ways around the issue. But the problem comes in with the scanner. I do not know of anything that will let you use the scanner without the drivers from the manufacturer, and without that you would be left with a printer and a fax machine. Unless the fax machine is a software fax, and then you will be left with a very bulky printer.
I know you use the printer part, but do you use the scanner, copier or Fax functions?