here is a site that has a hack for the Beige G3 AIO that allows you to hook the internal monitor to a PCI video card

http://www.shanecurd.com/wordpress/?page_id=10

this is not my site but a site a found looking for a hack like this but never did. having extendid desktop grew on me.
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Beige G3 AIO:
Rev B rom, Rev 2 mobo, G3 466mhz, 448mb ram, WD 120gb HDD, Pioneer DVR-110D, ATI Radeon 7000, USB PCI, OS 9.2.2 and OS X 10.4.8