Good news!
I think I found a working workaround.
This app works and so far worked well on 2 of the apps I use.
So with this, it’s technically possible for PPM to force landscape or even support portrait 
@Philips_Support_P What do you think? You can perhaps check what this app does. You can even add an option to use PPM in portrait mode although that might be too much work since you’ll need to support portrait on all Philips custom UI like the launcher 
But anyway, I think this app is the key. A working workaround and a possible source for a permanent fix 