Sounds cool. I think it's always good if you can nail a sub that gives you more than one option. I've been doing a move that sounds pretty similar but it ends up in a regular armbar. Say if my opponent has side control on my right side, I would get an underhook on his right arm (the arm that is pinning my left hip) gripping his shoulder, and pimp arm HIS left hip. With the pimp arm pushing away, i'll turn to my right side and sneak my right knee into his belly. From there, in one motion, I'll release his shoulder and push his chin away while throwing my left leg over his head and sitting up. In the end I'll have my right foot under his armpit, my left leg over his head, knees pinched together and take the armbar.