Looks like you're making the same mistake I made when I first tried to add ministers. If you add them to the Excel file nothing happenes. You have to open the said file as a wordpad file and add the ministers the same way you tried before. Should do the trick
I've now attempted that route as well, but it seemingly gives no results.
These are my additions to the ministers_csx file opened and edited in wordpad:
978117;Foreign Minister;Chen Gongbo;36;FA;Biased Intellectual;Very High;M750017;x
978118;Minister of Security;Zhou Fohai;36;FA;Silent Lawyer;High;M750018;x
978119;Chief of Army;Zhang Xueliang;36;FA;Guns and Butter Doctrine;Very High;Zhang Xueliang;x
978120;Foreign Minister;Lou Tseng-Tsiang;36;FA;Great Compromiser;High;M750019;x
978121;Foreign Minister;Chu Minyi;FA;36;Apologetic Clerk;High;M750020;x
The file is stored under Copy of Doomsday/MODS/Kaiserreich/db/Ministers