I have found that a small portion (1/5th of a tub) of Morrisons Best cafe latte ice cream, as part of a meal, doesn't spike me. Unusually it has fairly "clean " ingredients, cream, coffee, sugar no nasties other than the real sugar, no sweeteners. Think it's about 14g carb a portion
Also a mini "magnum " type icecream from Lidl, as part of a meal doesn't spike me. Again about 14g
BUT I do seem to slowly gaining weight
There are several low carb ice cream recipes around