No breakaway valve.
Right now with a small camera soft case on a neck lanyard holding the pump which then fits in an inside jacket pocket about mid-upper chest-level is what I've got. It's a hassle--but the whole pump is a hassle. Hell--diabetes is one colossal PITA all by itself. Glucose monitoring, highs and lows. Man! Not something good let me tell you!
But I'm not a diabetic; I'm a person with diabetes. There's a difference.
I think where I have it is relatively safe I case of a get-off. But its hassle coefficient is quite high. I'm hoping someone has THE solution, something I haven't thought of?
Be yourself. Everyone else is already taken.