[itsme]

The existing 'links' feature in MSP already allows opening MSCZ files in MuseScore Songbook. I already posted examples how that can be achieved (more to come).
Why and how I use this:
I edit scores in MuseScore on the PC, export PDF(s) in my favorite key(s) that I use in MSP as usual. Just in case a different key is required, I am able to open the original MSCZ file in MuseScore Songbook and transpose it within seconds.
To continue with the normal MSP workflow  I have to close Songbook.
Going to a different application is easy, the problem is coming back. As soon as the 'foreign app' is opened it receives all the user input, which is out of the scope of MSP.