Maybe you are saying that first the anger has to be accessible, then it can be worked with?

I am interested in your use of the word playful. I wonder if you would be willing to speak further about that word in this context.

An art therapy exercise comes to mind, maybe it would be of interest?

The exercise is to take a sheet of paper and draw a window frame on the whole of it, so that the impression is that one is looking out of that window. Then sketch/draw/color as aspect of one's life.

In the context of looking for a safe form of expression of anger, the exercise could be simply that you draw some aspect of the anger (as if you are regarding it through the window).