Shalom Linda!
Welcome and I'll be very happy to know you! I'm just now in a period where I need support because I'm stalled. But I've done very well since Shavu'ot and I think after to get used to it, it's very easy to do low carb diet in Israel, especially if you don't speak about it around.
The good news is that you can find today splenda in every grocery store around. There are two brands of it: Sucra Diet and Sucar Light. They come in packets in a box and I saw also once the sucra diet in liquid and powder form. Stevia you can find in every Health Store.
I'll be glad to be in touch with you and to answer as well as I can to all your questions.
Are you close to Haifa or to Kiryat-Gat? I live in Ramat-Gan.
Yael