... For sure, more modern cheap solutions in HD can make ones live more easy, but I don't like the ongoing "is not possible" myths.
It's not about any 'impossible myth' but simply about the technical conditions of the process.
The term 'in OS9 natively' implies 'from the original hardware, right out of the box' and that is NOT possible with a decent screen resolution to show up some DAW work.
(btw I couldn't even add another PCI card because not free slot left)
Those cards were ultra expensive back then and no go for bargain because (practically) no one deals with analog video anymore.
A presentation video should be a smooth experience for the viewer.
I once fiddled around on a Win XP box without success (3Ghz Dualcore and much faster Ram).
The simple solution was in fact a remote desktop session session captured by standard Quicktime on a MacMini (2.5 Ghz Dualcore) and both the convenience of operating the XP application and the crisp result were superior than anything I tried in Windoze.