I don't know if this will help you with WC but my understanding of trapping the hands is to do it before your opponents arm is fully extended and that this is actually close range. I can't think of an situation where trapping a punch at the end of the punch is a good idea or functional.
If I want to trap my opponent's hands I would do it at the beginning of my opponents punch and not at the end. If I were to take WC that's where my trapping would begin. Anything outside of that 50% range would be longer strikes until I can get into range.Within that 50% range punches will not land as hard , I can now start jamming and striking and take advantage of my shorter ranged punches.
In the context of a 4 sided ring. Having my opponent pinned in the corner on the ropes would force my opponent to play my game. In the middle of the wring, he would be forcing me to play his game. So I have to change from close quarters to distance and mobility.
Also if I wanted to learn WC, I wouldn't spar with another WC practitioner unless he pretty much abandon's WC and turns into a brawler. My Jow Ga sparring partners did that a lot so me using my techniques against them was more like what I would be against in the street in terms of the types of strikes I had to deal with.