>Foxit Reader has a "Typewriter" feature that does this. The free version
>does not allow you to save the filled-in document, but you can print it.
>I use it often.
>
>http://www.foxitsoftware.com/pdf/rd_intro.php
Just a thought I had.
Maybe you can install a postscript print driver and
print the "typewriter" changed form from Foxit PDF Reader
to a postscript file and then convert the postscript file to a
PDF file with Ghostscript.