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You've reached the limit of my understanding of PPLs, other than they sound like a pain.

Learned something today. I had an error with some software that relies on a command being called through a batch file. My code that has worked for years was all of a sudden failing. After a bit of digging I noticed my user has some French characters in their surname, so the path to the temporary files I was generating had these non-ASCII characters in it! If I ran my batch file from CMD.exe Windows was replacing the French character with multiple ASCII characters which is obviously not going to work. The simple solution is to change the active code page to 65001 which is UTF-8. (See: https://stackoverflow.com/questions/11962172/echo-utf-8-characters-in-windows-batch), so all I did was add the chcp 65001 command to the beginning of the batch file et voilà!

I've never used PPLs, but my understanding is that they can only externally call other PPLs, and will include copies of any source code they call, including the Action Engine VIs that the CVT is based on. To use the CVT for communication, one would need to make a PPL out of the CVT and call that from both your other PPL and the main program.