I know everyone's different... this research points in another direction:
Quoting from the abstract, it says, "Stevia preloads significantly lowered postprandial glucose levels compared to sucrose preloads (p < .01), and postprandial insulin levels compared to both aspartame and sucrose preloads (p < .05). When consuming stevia and aspartame preloads, participants did not compensate by eating more at either their lunch or dinner meal and reported similar levels of satiety compared to when they consumed the higher calorie sucrose preload."
And also, this: "Additionally, stevia preloads reduced postprandial blood glucose and insulin levels, suggesting stevia may assist with glucose regulation. "
This was of course tested on sugar-burners, not people in ketosis. But this and my own glucose readings are enough to convince me that stevia is fine for me.
Plus, I grow it in my garden and am learning to make my own extract.