@peternlewis would you consider implementing an an inbuilt Progress Bar in the Group Action, enabled with the Gear Menu like For Each Action? KM could count the number of enabled actions in the group and increment the Progress Bar as each action finishes. The Progress Bar could be named using the name of the enclosing group.
It strikes me that this would address the most common use case, and make the UX for using a progress bar smoother.
Thanks for considering my request.