There were various applications that allowed you to send raw PS to a printer. Cricket Draw came with one -- I recall using it in the mid/late 1980s to test raw PS files that I had written before I embedded them in PageMaker docs. Have you checked what the LaserWriter Utility from Apple can do?

If you have a Mac with System 6 and later, here are some useful tricks using Mac OS X:

http://www.vintagemacworld.com/osxprint.html