Roundhouse kicks with the ball of the foot is not a hybrid. it is actually the main way of doing it in many karate styles.
(This guy is shotokan karate if I remember right.)
It is more difficult to hit with correctly, sure, but very good when you do.
Frontkick with the heel is a common variation and taught in kyokushin and many karare styles. it is not commonly done to the head in fighting, but Ive seen that too.
Front kick with the point of the toes is a very unusual version, but it exists. And as always, it helps if you train how to do it. Do it by accident or without knowing how (and where) and you might very well break the toes. Of course, if you wear a shoe (as in savate -where point toe kick are the basic version in both front and roundhousekick, or even in self defense) the point toe kick becomes much more useful.