I dont have any vid, but for some strange reason not many people are going hard on there backhand surfing a sup. I love surfing on my backhand and I am probably surfing more waves on my backhand than forehand at the moment.
I use my paddle on both sides of my body going backside

When Im trying to stall up or do a bottom turn on my backhand I have the paddle on the inside, when Im coming off the top or driving for speed I have my paddle on the outside

Use It were it feels right for you