It has to be said that 99.9% of cases this won't work.
The best chance of actually doing something like this would be to use
WHDLoad.
@Brian
Next I would see if one could make the RAD resisten (romtag).
RAD is
always resident.
If that works the following would perhaps do it:
Unmount DF0: , Mount RAD: as DF0: , Make the 'DF0' resistent in memory , Unpack ADF to 'df0' , reset and try.
Won't work. DF0 is created at boot time, whatever you do the previous system run won't affect it on the next.
Anyway, RAD is bootable for sure, but with lower priority than DF0. Regardless, most games will not work when booted from RAD, so it's lost cause anyway...
How does one make
the 'DF0' resistent in memory anyway?
My concern is that the real DF0: will mess with the system after the reset.
It won't, but it does have higher priority than RAD. Well, just not having floppy in DF0 will make the system boot of RAD. But... see above.