Thanks, I hadn't realised that you could do it in MAME. How do I get Launchbox to run these games via MAME? All my Apple IIGS games are .7z format, which is not in your list. I guess I have to extract all first (to give .2mg files).
EDIT: using MAME as the emulator with command line parameter apple2gs -flop3, nothing happens. On double-clicking the game I briefly get the sand timer symbol then back to the arrow. MAME doesn't seem to load.