This wheel would be excellent to help a child figure out a coping skill to use. It is a physical activity that a child won't have to think about when doing. I find that thinking of a coping mechanism to use in the moment when one is upset can be difficult, so to have a set of coping skills already set up and a fun activity to figure out which one to use would probably be best for a child.
This "Worry Tree" is a poster I would love to hang in my classroom. It is a resource I think students could refer to, when needed, to help them regulate their emotions and deal with their "problems" in an effective way. Eventually, they will be able to follow this process on their own, and develop their emotional competence - which is an important skill that underlies positive mental health (Reinke et al., 2011).