Hey holmieSG!
Welcome to Head-Fi, and as we say around here "Sorry about your Wallet!"
You can copy to the C3 by just using drag and drop.
What I do is create a folder on my computer with copies of all the songs I am going to put on the C3 sorted like you have there.
Then I put the µSD card in my card reader and copy the contents of that folder to the memory card. Which is a lot faster that sends them through the C3.
Then to make sure everything is in alphabetical order I run this program on the memory cards contents.
http://www.anerty.net/software/file/DriveSort/
Pop the card back into the C3 and you are good to go.
If you ever drag new music to the card, just run the Drive Sort program again to put it all back in alphabetical order. The C3 reads the card in the order items were added, that is why the sort program has to be run if you want an alphabetical order. You can also create a directory the C3's root called ZZZZ for example, drag all the folders in the root directory to the ZZZZ folder, then drag them back out to the root directory again, this will sort them as well.
If you are on OSX then the ZZZZ folder method works or there is a CLI utility called FATSort
http://atariage.com/forums/topic/196628-fatsort-for-bsd-linux-mac-os-x-and-unix/