You shouldn't have an issue. I've flown many times with insulin, I've had T1D for 37 years. Airlines are concerned about powerful Li-ion rechargeable batteries which could potentially start fires, but in hand luggage and in a demonstrable medical device they're fine. The biggest improvement for me was when we shifted from using syringes to pen injectors - I always had to explain why I had syringes in my cabin bag, but pen devices are waved through. You'll be fine.