I think I've seen this idea before, as well; I believe they also suggested using the rings themselves in the recipes for them.
I'd like to see that, with the ring CL ideally affecting the item that's generated; higher CL items simply having more poses, akin to how evolving items work. The way I thought on it, rings CL 1.0 - 3.9 would produce items with Rage Rank 1 poses; 4.0 - 6.9 for RR1 and RR2; 7.0 - 9.9 for RR1 - 3; and 10.0 rings would have all poses.
But, you're right; most of the ring animations are really very attractive, and I'd love to see them turned into equippable items... whee