I was going to get one of those trumpcard adaptors, but instead bought a Slinghsot, as I couldn't find anywhere that would sell me the adaptor only.
The Slingshot pro has a passthrough IIRC giving an 86-pin connector as well as the 100 pin Zorro connector.
I have a Picasso II that I was going to try with one of my A500s [just for the hell of it!] but it was my aim to use a Zorro II network card with the A500...