@Harm Horstman not necessarily saying I recommend this, but am curious to know: have you considered using a Variant for that? Either as separate menu-item or for instance by replacing the Add button with an Add task in combination with an Open Document (as Modal) process action.
Sorry, I don’t know anymore, we always find solutions to work around features that not exist. But over the years several times the idea came up for this simple solution and avoid the need of extra tasks and variants, because they result in extra objects to maintain.
If it works in Universal we are fine for know and ready for the future.