While some of these do look cool they won't play well in JA. The reason is, in vanilla, in order for the saber to defend it has to be in the way of the attack. When the saber is behind or away from the front of the character the defense check doesn't occur.
I learned this while making the backhand stances. I noticed that I was getting shot or cut a lot if I wasn't swinging my saber. That's why I had to add in a manual block animation to replace the leaning animations.