well, if ice clone is a good option for kungs teleport, it should be a good option for every move in the game, you just have to throw it and get in the desired position to deal with the move youre expection.
seriously now, if you managed to induce kung to teleport, do BP xx Iceball as soon as kung shows up behind you. its not hard to do it if you are just waiting for it. But its hard if you are holding block to deal with anything else, coz theres a few frames of "unblocking" before beeing able to attack. I dont have much experience playing the game, have had not enough oportunities to try and see if the "unblocking" frames can be canceled by a attack, seens like it cant.
Im having problems with kung lao but the teleport is lesser a problem than a solution to me, its the only time i can manage to do some damage. The other opening I can get is to EX iceball him as soon as he throws a hat, but you have to be way way fast on that, its more prediction than reaction actually, and obviously if the only thing u can to do beat someone needs prediction AND meter, isnt that realiable for solid playing. Cant jump out of nowhere to land something due his amazing antiairs. Cant jump the hat on reaction, its recorver is INSANE plus that you wont want to play against kung lao from the jump's range, hes really good there.
Im really out of ideas for beating kunglao with subzero. I have to play like 500x better than the other guy, to force him to do ridiculous mistakes in order to deliver some damage.
If the guy is good enough to dont need the Xray to antiair (aka a non retarded player with enough skill to do the normal spin on sub's jump) you will have even less oportunities to damage him, due subzero's nightmare; the breaker.