A brisk 20 minute walk at lunchtime will use the carbs from around 3 quality street - promise yourself them and take them with you on the walk.
Also you could swap them for some of the carbs in your normal lunch. Not something to do all the time but it won't hurt. Get yourself a copy of carbs and cals (Cheyette and Balolia), which gives you the carbs in different foods and try some old fashioned carb swaps
Also if your blood glucose isn't going sky high it could be that your pancreas can manage the small hit of the glucose from several small chocolates spread through the day.
Of course they also have fat and no vitamins and minerals and will probably put fat on you so not something to do all year round, but it's important to be able to join in sometimes - food has a social function as well as nutrients.