You don't have to worry about a jury if you aren't prosecuted.
And before you say that you can't count on the law to protect you from prosecution, I'll say that if you believe that you should selectively ignore laws, why ignore the ones designed to protect you?
Hope its okay to post on this thread again, I have seen quite a few posts about choke holds and pepper spray and I wanted to add my experience.
I personally experienced a very similar situation a long time ago when I was in excellent shape and I tried to grab and choke my assailant as he was pummeling me and pulling me out of the passenger seat of a friends truck. My hold lasted for a few seconds then he had me on the ground and broke some bones in my face and may have knocked me unconscious if both my friends and his friends hadn't pulled him off me.
I do not carry pepper spray because the rest of my family has significant asthma. I tested a small squirt of pepper spray years ago while downwind and away and both my wife and daughter started to have difficulty breathing, it didn't bother me much.
I was in college at the time and had been out partying when we were returning home my friend driving and the driver of the other vehicle had some road rage, so a hot headed passenger in the other truck decided that I needed a beating. As I said I was in great shape and much better able to withstand a beating then than I am now, and was glad I took the brunt rather than my friends. I was okay other than a fracture of the occipital orbit which did not require any repairs. I had a significant black eye for a while.
If that were to happen today the assailant would be dead.
Pleasing that this turned out well for you.