We spar and practice chi sau at our school.
Chi sau has many practical applications to a fight. The way of intercepting fist, is largely misunderstood. We don't train to try to get the opponent into a trap hands situation, we feel where the opponents force is going and roll with that energy to do them in. Whether it's a trap, punching, leg kick, or all of the above at the same time. If you go into in premeditated, it will fail, you can't force it. You have to adapt to your opponent immediately and flow with their force.
To intercept fist, you don't "try" to grab, latch, or trap so much as intercept the strike with deflection and immediately keep your arm contact with that limb. Hense, chi sau starts.
ex: And opponent does a quick boxers jab, pulling the punch back quickly, use tan sau and step into the fist following the fist as it retracts back to punch (jab) a second time. thus, keeping contact at the wrist or arm, intercepting fist, so you can adapt to the opponent's next move, not force technique on a spontaneous attacker.
You learn chi sau in a 'regimented" fashion to teach you the techniques available, not to try to force specific techniques on an attacker. Their supposed to be there in your arsenal for use when the situation calls for it. So, in a way, after awhile, chi sau becomes sparring. And after awhile you will use kicks and leg sensitivity in chi sau.
As for kicks and deflecting them. That's what the legs are for. WC kicks will deflect or just plain stop most other kinds of kicking. Garn sau can also be used for higher (head high) kicks. All this "bridging of the gap" is accomplished by simply stepping into your opponents attack and guard or space while deflecting. It will happen more naturally if you think forward thought while defending and deflecting.
"offence is defense, defense is offence. Each is the cause and result of the other."