Rick Macauley showed us this move at his seminar. Thanks to Andrew for helping me with my notes.
Establish bicep slice half guard on his right side. Remember that your left leg rotates in for biceps slice while you hold his right cuff with your left hand.
Escape your hips out to make some space. Bring your inside (right) leg across waist out to opponent's outside (right) hip.
Prop yourself up on free hand.
Roll onto your knees facing away from the opponent, but still holding his cuff.(skip step when you get better).
Do a FORWARD roll into omoplata.
Rick also finished the omoplata with an armbar: Stop on side with your top knee over his back. Can push on his hip with your other foot for leverage if needed. Armbar. Keep it if he rolls.
Phil Migliarese likes a similar movement where you spin on your back to the omoplata instead of rolling to it. It is like the pendulum sweep to belly-down armbar spin. Hard to explain entirely, but easy to do once you understand it.