I have used a 'ISOSTICK' USB thumbdrive with the ISO image mounted on it. Just make sure to format the MicroSD card that goes in the usb stick as FAT32.
http://isostick.com/
I have installed System Platform and CM 6.3 using it.
A external dvd drive (powered) 16x or 20x is the best. That will speed up the copying of the files, but the install is still slow because the S8300 card is not much faster than my Commodore 64
David