One thing that you can do is find a hard candy THAT YOU DON'T LIKE, and keep one or two in a pocket where you can get at them if you need to. As you gain experience, you will know when you need them.
If you don't like them, you won't be tempted, and they're a good bit cheaper than those sucrose tablets.
As an aside, if you are using the Levimir pen, you may find keeping it cool without freezing to be a problem. I use a Stanley Thermos that belonged to my dad. A small piece of ice enclosed in a ziplock or a small waterproof plastic tube will keep the interior of a Stanley in the proper zone for more than a day. As a worst case scenario, you can refresh the ice by bying a soft drink with lunch. I assume that if the pens get damaged inside the Stanley, I have just been in an accident severe enough that they are the least of my problems.