What I want is effectively Gamba's SE/30egs, and it is a IIsi PDS to Nubus adapter that I had thought it possible to cannibalize, but I shall investigate the other options. I am some weeks from doing anything yet.

I think I have three of those IIsi cards. But on Gamba, the thing I really need and that would make all of this straightforward is just the angle adapter that he sold to make dual PDS setups in the machine trivial. I don't suppose anyone kept a few spares?