After the success on Mac Os 9 boot on the unsupported MDD FW800:
http://macos9lives.com/smforum/index.php?topic=762.msg4520#msg4520

This thead is open to discuss the Mac Os 9 boot on the unsupported iMac G4.
A good starting point may be from this post on 68kmla:

https://68kmla.org/forums/index.php?/topic/21515-os-9-on-ibook-g4-findings/