I’d be happy to give this a go. I do think something like this would be beneficial for managing incomplete, associated subtasks.
I’m also interested in a tool that when ran it identifies instances where all subtasks are complete yet the parent is not. Rather than taking action, it would be nice to bring awareness to the condition. I often find that when all subtasks are complete it doesn’t necessarily mean the parent task is complete (e.g. subtasks are missing). This would provide the option to complete the parent or add additional subtasks to conclude the ultimate goal. Do you see any value in this?