AFAIK you are using Hal9k Mod v5. It should have this possibility according to its changelog in the OP:I've purchased NavRadio+ and installed into my PX30 HU. Everything seems to work as expected, nice job.
The only issue that I think is not directly related with NavRadio+ is the FM physical button of my HU which allows to start the radio app. After disabling the stock radio app in factory settings, such button now does not make anything. How can I make that button to start NavRadio+?
48. Added the ability to select applications that will run instead of stock apps. You can start your player with a button on the steering wheel