we do not have so much self defense in kyokushin-training. sometimes only as bunkai during kata-training. the time goes by to fast... ;-(
during self defense training at my job, we perform a tchnique nearly by "mawashi-uke" for blocking. at this technique the forearm should be protected with a shirt or jacket of yourself, getting no cut with the knife.
it is difficult to say what is the right technique. where does the attack come from? straight on? from upper side? or anyoneelse...
the 100m escape is a good idea...hope your opponent is not as fast as yourself.
OSU!