This is just a thought, and I'm not an expert with the program, but isn't it possible to add media code support with Media Code Speed Edit? You'd swap the code you want with one that is already in the drive.
Starting with the YL05 firmware, you should be able to add the mid code since you have an example of the disk on hand. This will produce a modified firmware with which to flash the drive (voids warranty by the way).
Again, I'm not an expert on this...ala42 is the man to speak to.