What a difficulty for you. Do your supermarkets sell any kind of tinned meat that you like (not stuff with added carbs) which with a stock cube and any diabetic-friendly vegetables that are either fresh but reduced as they are getting a bit past it, or are tinned or frozen, can make a soup which tastes great even if it may not look beautiful. A plus if you can add some fat in the form of cream, oil or butter (I appreciate there is extra cost here but something might be reduced for one reason or another). It's possible with tinned fish too, but I'm not sure if you like that.