A font converter from truetype to grx format was built by Herbert Richard, his home page is out, but I have a local copy in: http://www.terra.es/personal/malfer/grx/resourc.htm
Do you happen to have DOS binaries (.exe) to do the job?
Oops, I sure should have opened the archive (the exes are there), before posting that question, sorry.
Works great! Many thanks for your help.