To mount ADF files on Workbench you should use Disk Image Device.
http://aminet.net/package/disk/misc/diskimage.m68k-aosMost games need to autoboot and won't be readable so you'll need to write them to floppy although you should be able use a WHDload install to install to hard disk without writing to floppy.
I've not used adfblitzer myself but it should be fine for writing back to floppy.