Do you still have the old printer? Any idea who is (was) the OEM?
Will the Tonoref I accept a stand-alone printer? I notice that Nidek (Marco) RT-5100 printers sometimes pop up on eBay. They appear to have a Centronics (or Centronics-like) connector at the end of a long-ish cable.
I'm also wondering if a printer from one of the later Tonorefs (or similar) could be made to fit?