Darkfalz has a good bit of info about this and a large collection of original sorts. Unfortunately, he doesn't yet have one for this game.
http://darkfalz.kiczek.com/darkfalz/
To use a sort, you just add the sort option to your mkisofs command.
ex:
mkisofs -C 0,11700 -l -o eviltwin.iso -sort sorttxt.txt -V EVIL_TWIN data
Note that "data" is the name of your game files directory. If you use another name, you must change it in the sorttxt also... and it IS case sensitive. For example, if you want to call the directory "EVILTWIN" instead of "data", you would need to change each line such as "data/1st_read.bin" to "EVILTWIN/1st_read.bin". The easiest way to change multiple lines is using the find/replace feature in something like "editpad".
To make sure you did it right, you can check the order of your files in isobuster. To be able to open your iso, either use lba 0,0 instead of 0,11700 (on a test iso), or just use isofix. I highly reccommend checking out darkfalz site for more info and some really handy tools.
-Ex