I am closing this question. Personally I think the way to go should be MetricKit. But it failed so far delivering anything, so I can not prove that is will work in our products. Will ask a new question. Perhaps I miss something or there is a undocumented behaviour for development builds or....

This entitlement does allow me to suppress/filter incoming notifications. So far, so good. What I don't gather from the documentation is: Does this include notifications by other apps? (Which would explain the questions Apple asks when applying)