Most of the info was really out there. But at its time The Os X propaganda was really effective. And the very few users that resisted with Mac Os 9, were calmed with a reedition of the the Mac Os 9 enabled MDD.
The very few that digged for some information, were aware about the existence of the Custer ROM, and a how it reveals that the Mac Os 9 support was a question of the ROM, drivers, and "something more" ...
The OF flash needed to enable the 7448, 7447 CPUs, shows that something in to this direction should be made.
We don't know exactly what to do until iMic, nanopico and others begin its great work, and find the details of the process.
It's not the same to spend today 50-100 bucks in a unsupported iMac, eMac , MacMini, etc.. and make some tests than spend 1000-2000 bucks at its time to make some test...