So the way I do it is this:
1. Get to double unders. You really need his hips pretty far off the ground, in a high stack.
2. Feed the lower part of one of his lapels to your cross side hand. Doesn't matter which direction. The guard player can prevent you from getting the high collar grip but can't really stop you from getting a lower lapel grip.
3. Move the knee of the non-lapel gripping side to the middle. Your knee should not be touching his butt, you should still be hipping in from a low squat with good posture, but you want to start moving your body to the lapel grip side.
4. Your non-lapel gripping hand should move from wrapping around his leg to grabbing his belt or the lip of his pants to keep his hips in the air during your transition.
5. Once you're in position, you basically dive to the lapel gripping side and the knee of your non lapel gripping side comes up behind his legs in the leg drag position. He will still be facing up, you'll be basically on your side though pushing into him. Now release the hand that's grabbing his pants/belt and reach around his leg on your lapel gripping side, and feed the lapel to your other hand (the hand that was holding his belt). This should be his cross side lapel. Your other hand now grabs his belt as low as possible.
6. You should now be in a tight leg drag position, albeit on your side. Work your way to your knees gradually pushing your opponent onto his side. If you maintain the leg drag position the orientation is less important. Just don't let your leg drag control falter.
Very cool! I can't wait to try this.