Agreed. About the only thing that makes the onboard video bearable is 1MB of cache - and the easiest way to find that is onboard a G3 upgrade. Once you've got one of them (which doubles as a PDS riser), you might as well add an HPV or AV card, both of which have standard Apple video ports.

The best way to add a DB-15, IMHO, would be to mount it on the back above the HDI-45, and jumper the pins to the appropriate solder points, or piggybacking onto the internal HDI-45 leads.