I tend to buy the low far Weightwatchers yoghurts and also as a treat if Bg is low, Timperley Rhubarb ones from M & S. They do a terrific range but it all depends on how many carbs and how much sugar you can tolerate ?
As for eating too much fruit.....yes you can eat too much. You will soon know because you will be a permanent occupant of the loo !!!!
Moderation in all things and test, test, test. That will provide the answers.
As an example: I can manage to eat a Peach and a Nectarine then after two hours my Bg level has only risen just over 1 mmol/l. Couldn't touch a Banana though. We are all different.
Ken.