If you already have a double-sided floppy drive, then you don't have any reason to make flippy-floppies to use that second side of the floppy.
To read the second side of flippy-floppies that you already have, you use the single-sided software that wrote the disk and that only uses a single side of the floppy and flip the floppy over. Then you transfer the data to a normal double-sided floppy.
Comments
If you already have a double-sided floppy drive, then you don't have any reason to make flippy-floppies to use that second side of the floppy.
To read the second side of flippy-floppies that you already have, you use the single-sided software that wrote the disk and that only uses a single side of the floppy and flip the floppy over. Then you transfer the data to a normal double-sided floppy.