The idea of removing the pci network card is only of getting one pci slot free since there are only 4 slots.
The idea of using more than one gfx card is in fact to use more than one (or more than two) monitors, and not a switchbox to use only one. I have used such a box for a long time when I had AGA+CV64/3D on my 1230 ... now I have got a little bit faster PPC card ... not top of the line but still faster than 68030 :-)