Simple sneakernet solution: Format a 720k disk, copy a zipped ADF to the disk, should fit. Transfer the Zip to the A600 and copy to RAM* and unzip. Then write the ADF to disk. Can be done easily. You have to have CrossDOS or other PC file system driver on your WB disk. Also copy ADF2DISK to it as well.
* recommend 2MB Chip RAM on A600 for this to go smoothly, but 1MB should suffice.