The way you isolate the arms is great. You do this with a reverse knee on belly, but you can also use these steps for arm isolation with dual leg hooks and flattening out your opponent with your hips.
Great technique and makes sense however against an actual resisting opponent it will not work unless you are a very proficient grappler and have the assistance of a second person to secure the legs.
@Jay Wadsworth Purchased your instructional from Effective self defense. I tried this in my officer safety assessment today, but his arms just wouldn’t pop out- his head was all the way out to the side too, but I just couldn’t get the space to shoot in for the wrist ride. He was a very big guy and was keeping his arms super tight underneath him. Any suggestions? I had to resort to using my baton as a lever, but would prefer to do it with my hands where possible.