I think that I know the answer but want vet advice
I cannot eat artificial sweetners. I bought fat free plain yogurt, and added a tiny bit of homemade no sugar added strained jelly that I made before surgery just for that purpose. I also added it to ricotta later on in the process. but if you can eat artificial sweetners the flavored non fat yogurts (especially the greek ones will be wonderful for you !)
Most fat free, sugar free yogurts just didn't taste great to me, so I chose to eat Greek plain yogurt with some added sugar free syrup or sugar free jam. This had way more protein and tasted better to me. But in truth, I mostly kept my eye on the carb count and made sure I did not go over 40 carbs in any one day. I always counted my supplements when figuring this out.