Use the instructions except of deleting the German files in Step 2 and don't use
i6comp d data2.cab 92 datav_de.dat
i6comp d data2.cab 93 datas_de.dat
in step 3.
You should get a version with English and German on a single DVD.
You also can try this conversion
http://fileforums.com/showthread.php?t=69067