After reading the hint on changing fonts using Font Lab, I remembered having a free font editor from Apple of all places. If you have the Asian Fonts installed, in the /Applications -> Utilities directory there is an Asia Text Extras folder, which contains of all, a font editor (called TrueType Font Editor).
See Apple Knowledge base article 24435 for more info on the program.
[robg adds: Yes, it's a hint on finding a program in a folder! But given that I had never stumbled across this one, I figured there might be others who might also need a quick pointer...]
Mac OS X Hints
http://hints.macworld.com/article.php?story=20030501221805879