First things first. Based on the logging output I received it seems like (some?) models aren't properly recognized as being of the Time model/platform (which means my changed code to add the timeline pins for notifications isn't triggered). After that is fixed I can try to finish/debug the actual changes for the notifications, and I then might be able to look into some other issues. But by that time I hopefully also will finally have my own Time Steel, which makes debugging a lot easier.