If however, you can get in there AS uke raises his hand to strike, hit him with your off hand and use your lead hand to extended his striking hand BACK so his elbow is behind his shoulder and over the old "third leg of the stool" unbalance point, then he will have a harder time hitting you again.
the yokomen strike that we practiced isn't the standard wideass swing that many aikido folks do. it's more like the karate reverse knife hand strike. the trajectory is straight in like a punch to the face with a hips rotation at the end to give it a slight curve. ya, our yokomen took the center line, then slight deviation at the end to go for the side of the throat. normal aikido entry as you described above won't work. just my 2 cents.