Just kidding: seriously, I it works! The tricky bit was that I had to use Pronto2NEO Converter version 1.5.2. It did not work with version 1.5.0 while all other conversions I made have worked with 1.5.0...
I am wondering: did you have any problem learning the IR code on your Pronto? If not, appearently the Pronto has better learning software than the NEO...
Anyway, I am happy that I finally have a working code.
To sum it all up for the others:
Thanks to affe, Pat Spector and Charles Lee we now have a working ProntoNEO code for the Sanyo PLV-30 projector and its clones. Use Pat's Pronto2NEO Converter 1.5.2 to convert the Pronto code to a ProntoNEO code. Then use Charles's NEOHacker 0.7 to insert this code into the action of the appropriate button.