Good topic.
In Taiji, we have “opening” methods used to break through a strong guard and get in to strike.
For instance, you could strike his right inner arm with your right hand, bring hte left hand under and strike his arm a second time in the same spot, strike his left forearm with the right hand (opening him up), and then strike with either hand to the face. I call this move “opening the veil” because it feels like you are parting stage curtains. If you come in for hte final strike with the left hand, the move is more economical, and a bit quicker. But if you strike with the right, the final strike here is more powerful.
You could also simply strike his inner right forearm with your left hand, then strike his inner left forearm with your right hand, and then rebound off of that with with a right punch to the face.
You could also strike the outside of his right forearm with your right palm, then slam your left palm down on his elbow, and strike him in the face with the right palm. This one puts you on the outside of him, and if you hit his arm hard enough, he will turn so that you are to his rear corner.
These are all done with a step in.
Or you could use P’eng to block his feint and try to catch his wrist, then step back a bit and jerk him down. He’ll try to pull his hand back once you make contact, making the catch really firm, and the pull down will be Hell for him to take.
I’d recommend the first couple of methods, though. They set you up for some really nice techniques. For instance, the first might be followed up by Brush Knee Twist Step. You could crank his right arm up, and pull his head down by the neck to slam his face into your knee. The second sets you up for something like grabbing around his neck with the left hand, and pulling him forward so you can drive your fist into his throat. The third sets you up for grabbing him around the neck with your right palm so you can pull his head forward and cut across his throat with your left palm. These are just examples, though. There are probably a hundred techniques you could do from each of these opening techniques.
I find that the best thing to do when someone won’t commit is to wait until they start to throw a feint punch or whatever, and quickly move in with an opening move. This upsets their timing and distancing enough for you to take control. All you need is the initial strike to distract them for a moment, and then you can explode on them with pretty much anythign you want.