Yeah you are right but im missing visual finetuning in your solution. When I have different versions with different button positions I have to set them by code I think. Therefore, this would be tedius for repeated usage.
The solution with the child actors fits better I think. However, the naming in the editor is quite ambiguous.
Like this for example. I cannot click on them as I will always automatically select the TaskManager. I can click on them in the details view but renaming is not an option I can see. However, this is only a minor annoyance and I can live with that.