My son is type 1 diabetic also. I think the only products he eats with artificial sweeteners have sucralose. But he can eat sugar without a spike if we bolus right. Do you have a monitor or have any idea what your blood sugar peaks are at after meals? He is only 12 and just 61 pounds and eats about 1850 calories a day (120-150 grams of carbs) and our post meal peaks only average around 145 and he only hits 200 maybe once every 5-7 days which is quickly corrected due to having an accurate monitor, and a pump. I know that the average post meal spike for a type 1 diabetic person is about 240. We’ve only touched 240 maybe 3 times in the last year either due to illness or a pump site going bad.
We use sweet tarts (basically pure glucose) to prevent lows. The main problem with “sugar” is that it is half fructose, and at 25+ grams of fructose a day, you may start to develop fatty liver disease. Aside from that, we don’t really have a problem with occasional regular sugar in treats causing spikes that outrace insulin. If anything, we have had more of a problem that his insulin works faster than his food, because he eats a significant amount of fat, and so his carb ratios are low (around 8:1) but his basal is also low (about 7 units per day).