Adam knows his rabbits!!!
If youre into rotations etc, to me you sound like a confident kiter. So if you attach your leash to the depower rope at the stopper ball just above the chicken loop youll be riding suicide. Meaning there will still be some power in your kite when you hit the safety.
But lets be honest, there is so much depower on the rabbits youll hardly notice it dude. Try it in some average winds and see if you feel comfortable with it befor you take my word for it. Its the way many others rabbit users ride with no problems.
If not, id attach the 5th like you have just below the swivel, this is called the double depower set up and would kill 99% of the power if thats what you want but youll still end up with the 5th wrapping around unless you ran it trough the bar. (Are you having trouble figureing out how to run it through the bar???)
Alternatively you could leash straight onto one or the front lines.
Drop me a pm with your mobile number on and i'll give you a buzz if you want anymore help with anything pal.