Excuse my ignorance, but I have a problem in item 6 to create the command batch. In my case, I want to language Spanish. I find it very tedious to do manually. Someone could help me?.
Finished. I found another quick way to delete the other languages without having to use a command bat.

My final result (game in Spanish):
Setup-1b.bin: 3.04GB Compile time: 38 min.
Setup-1a.bin: 1.25GB Compile time: 8 min.
DVD5 finished size: 4.32 GB
Installation total time: 6 min
Many thanks to Onizuka87k and REVO and also to d00m3d.