Firstly, Class 10 cards are not only a waste of money, but they sometimes cause compatibly problems. I do not recommend them; Class 4 is plenty fast enough.
Secondly, what is the format and bit-rate of the files now? You do know that transcoding is going to reduce the sound qualtiy considerably, especially going down to 128kbps, right?
Thirdly, there is no way to make this entire procedure automatic. It will require intervention and participation from you.
