It would probably be easier to purchase something like the Prometheus PCI -> ZorroIII bridge and use Voodoo and Realtek based solutions instead. I've heard loose talk about these being (unofficially) compatible with Zorro II slots, but haven't tried/seen it for myself. I think red still sells them for $139 along with brackets to fit it all into a desktop case. Although it wouldn't be as slick as using your built in ISA slots, it's probably more practical.
I've currently 2 A2386 bridgeboards in my possession. Is this "Etherbridge" capable of allowing me the use of an ISA network card on the Amiga side via one of these bridgeboards? Can someone elaborate on that product a little more?
Thanks,
Adrian