This is exactly I dont't want to do.

First Quad is deep under the table in the corner

And second is not sufficient remove first card, I need swap it for Nvidia FX to see OpenFirmware screen. It takes two slots, i.e. I need to remove NIC card, etc

Simply, is much easier do it SW way, if it is possible.
AmigaOS3: Amiga 1200
AmigaOS4: Micro A1-C, AmigaOne XE, Pegasos II, Sam440ep, Sam440ep-flex, Sam460LE, AmigaOneX1000
MorphOS: Efika 5200b, Pegasos I, Sam460LE, Pegasos II, Powerbook G4, Mac Mini, iMac G5, Powermac G5 Quad