Possible to force install other Mac OS'es other than ones shipped?

Hello everyone!
So, I have a power mac G4 2003 dual 1.25 MDD model and although I have the original install/restore disks for 10.2(Jaguar) and OS 9.2.2, I was wondering if there is a way, or if it exists, of hacking the firmware to allow my system to boot anything lower than 9.2.2?
Although, I got a glimpse of what OS 8.6 and lower looks like through Sheepshaver, I wanted to go a little step further and see if it is remotely possible to FORCE recognize on boot any version of Mac OS other than the ones that came with the machine?
I want to natively boot into Mac OS 8.6 and see what it looks like in full screen and just to see how it runs for nostalgic reasons. I know System 7.6.1 won't work for sure, though there has to be a way to allow the system to recognize by force mac OS's that are lower than what came with the machine?
Even Puma and Cheetah would be interesting to see. Again, I know this is a rather stupid question or request, but has anyone ever done this, or if it is remotely possible?
Thanks and have a great Monday!

There are plenty of examples where what you want to do would work fine. But on the specific Mac you are using, the mirrored drive doors G4, there were major architectural changes.
The Bus Controller used in previous Macs was replaced with a different High Speed custom Integrated circuit that provided access to a never-before-seen type of memory running faster than ever before. No support for it exists in any previous version of any Mac OS. That same IC also provided a previously unseen Interface to the Hard drive, now at ATA/100 speeds. Another new Interface running at speeds never seen before. And that same IC also provides an Interface for FireWire 800 in certain models, another architectural change. The performance gains are remarkable. That it will not run older versions of Mac OS is completely unremarkable.
Your Mac has a completely different Hardware Architecture for its Memory and Hard drive. There was no code to drive that Hardware in previous versions of Mac OS because that Hardware did not exist when those versions of Mac OS were written. If you want to run older versions of Mac OS, you WILL need an older Mac that can run them. If there were a way to hack it, this community would know about it and tell you.

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