I think that the key to cracking, so to speak the ear-muffs defense is the uppercut. Left or right handed. If he has his hands around his head he can't punch back. Uppercut.
Also, the straight right hand to the solar plexus is a good punch.
I think your goals are sound; it shows that you are thinking, which is the foundation of boxing. But try this...settle down to where you are confident in your ability to not get hit with jabs and right hands. Then begin slipping those punches: pick a counter to each and work that into your routine. For example: today, slip outside a right hand and counter with a right hand. See what that opens up- the left hook to the body is a good place to start. Or, slip outside a jab and hook the body with your left. Easy, effective counter that keeps you out of range of returns. What does that lead you to?