But doesn't Amiga QII use the same pak files etc as PC QII.
I know for QI all you need is the PC version unpacked on your Amiga along with one file called AmigaQuake (or similar). It's the same with the Doom games.
QII should be the same, get the PC version, unpack it (or install it on the PC and copy the dir to the Miggy) and use the Amiga QII exe. If you can find the Amiga QII exe.