No. Apple has made sure that you won't use OS 9 on that machine (and all other newer machines). It's not only that the firmware might have some settings that actively disable OS 9 from booting, it's also that OS 9 has not been updated in a while and just doesn't "know" your type of machine. You can't expect a three or four year old operating system to know anything about newer processors, graphics cards, motherboards etc. And even if you _could_ trick your PowerBook into booting the thing (OS 9), you'd still lack drivers for most of its hardware features. That wouldn't exactly make a 'working solution' in my opinion.
1.) Get used to using OS X.
2.) Use old applications in Classic.
3.) Replace older applications with newer versions that support OS X or with replacement software that does.