'teaching' boys correct support in rings

Next to doing gymnastics myself I'm also training boys a few hours a week. The are between the age of 6-9, and ALL of them have trouble with support on rings. They have the rings turned inwards as much as possible and still also have a slight bend in the arm. This ofcourse also costs a lot of points with competitions. I've tried to get them stronger by doing a lot of support in rings, sets of time, but that hasn't seemed to help. I'm thinking now maybe I should do dips with them, but I am not sure.

So how can I get these boys develop more strength on the rings? Are dips good?

Work basic strength with them

Body rows, pullups, dips, etc. Once they have a certain level of muscle strength & mass it makes rings supports much easier to learn.

Supports anyhow are good even if you have to slightly assist them. Only work rings parallel/then turned out once they can hold for at least 20-30s.

Dips are good but very challenging if done on a set of parallel bars.

Ring pushup hold and pushups work well.