I tried the high karate about 5 times shooting to split the two balls. I got kisses every time because of the two balls being close together -- the cue ball almost immediately hits the 2nd ball of course, before the first one has a chance to clear. So in my 5 tries only once did the cue ball stick there and the other balls left for a good result. But always at least one ball cleared the area. But on net, I decided I did not like this shot, because 4 out of 5 times, they had a nice bunny either on that 9 or the 3 ball ( when the 3 got double kissed).
So I would go back to taking a foul by rolling toward, or even just above, that far right corner pocket, and let him shoot at the combination from there. By leaving the combination straight in, at least there will be a definite penalty in the event of a miss. When you roll to take the foul, you'd like to get as close to that corner pocket as you safely think you can -- but definitely not in it enough to pocket scratch!