The interface you mention is the lisa lite from what I can gather. And i don't have that since my lisa is a 2/10, which has a different I/O board. Meaning that you don't need the adapter to plug in 3 1/2" drives.

Update: I tried removing pins 9 and 20 (assumming i got them right) and the eject sound stopped. But it appears either to read very slowly or not read at all. In other words, it doesn't work. I guess that without an 800k rom it's not really possible to use an 800k drive.

I sent you a pm oldappleguy, so far you're my only hope!